File: zfs.8

package info (click to toggle)
zfs-fuse 0.7.0-12
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 10,196 kB
  • ctags: 15,303
  • sloc: ansic: 154,043; sh: 9,694; asm: 1,690; perl: 367; xml: 300; python: 269; makefile: 83
file content (3182 lines) | stat: -rw-r--r-- 105,564 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
'\" te
.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License. You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.
.\"  See the License for the specific language governing permissions and limitations under the License. When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE.  If applicable, add the following below this CDDL HEADER, with
.\" the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
.\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License").  You may not use this file except in compliance with the License. You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing.
.\"  See the License for the specific language governing permissions and limitations under the License. When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE.  If applicable, add the following below this CDDL HEADER, with
.\" the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
.TH zfs 8 "21 Dec 2009" "SunOS 5.11" "System Administration Commands"
.SH NAME
zfs \- configures ZFS file systems
.SH SYNOPSIS
.LP
.nf
\fBzfs\fR [\fB-?\fR]
.fi

.LP
.nf
\fBzfs\fR \fBcreate\fR [\fB-p\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBcreate\fR [\fB-ps\fR] [\fB-b\fR \fIblocksize\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fB-V\fR \fIsize\fR \fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBdestroy\fR [\fB-rRf\fR] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBdestroy\fR [\fB-rRd\fR] \fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBsnapshot\fR [\fB-r\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR]... 
      \fIfilesystem@snapname\fR|\fIvolume@snapname\fR
.fi

.LP
.nf
\fBzfs\fR \fBrollback\fR [\fB-rRf\fR] \fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBclone\fR [\fB-p\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIsnapshot\fR \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBpromote\fR \fIclone-filesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBrename\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR 
     \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBrename\fR [\fB-p\fR] \fIfilesystem\fR|\fIvolume\fR \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBrename\fR \fB-r\fR \fIsnapshot\fR \fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBlist\fR [\fB-r\fR|\fB-d\fR \fIdepth\fR][\fB-H\fR][\fB-o\fR \fIproperty\fR[,...]] [\fB-t\fR \fItype\fR[,...]]
     [\fB-s\fR \fIproperty\fR] ... [\fB-S\fR \fIproperty\fR] ... [\fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR] ...
.fi

.LP
.nf
\fBzfs\fR \fBset\fR \fIproperty\fR=\fIvalue\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR ...
.fi

.LP
.nf
\fBzfs\fR \fBget\fR [\fB-r\fR|\fB-d\fR \fIdepth\fR][\fB-Hp\fR][\fB-o\fR all | \fIfield\fR[,...]] [\fB-s\fR \fIsource\fR[,...]]
     all | \fIproperty\fR[,...] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR ...
.fi

.LP
.nf
\fBzfs\fR \fBinherit\fR [\fB-rS\fR] \fIproperty\fR \fIfilesystem\fR|\fIvolume|snapshot\fR ...
.fi

.LP
.nf
\fBzfs\fR \fBupgrade\fR [\fB-v\fR]
.fi

.LP
.nf
\fBzfs\fR \fBupgrade\fR [\fB-r\fR] [\fB-V\fR \fIversion\fR] \fB-a\fR | \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBuserspace\fR [\fB-niHp\fR] [\fB-o\fR \fIfield\fR[,...]] [\fB-sS\fR \fIfield\fR] ...
     [\fB-t\fR \fItype\fR [,...]] \fIfilesystem\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBgroupspace\fR [\fB-niHp\fR] [\fB-o\fR \fIfield\fR[,...]] [\fB-sS\fR \fIfield\fR] ...
     [\fB-t\fR \fItype\fR [,...]] \fIfilesystem\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBmount\fR 
.fi

.LP
.nf
\fBzfs\fR \fBmount\fR [\fB-vO\fR] [\fB-o \fIoptions\fR\fR] \fB-a\fR | \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBunmount\fR [\fB-f\fR] \fB-a\fR | \fIfilesystem\fR|\fImountpoint\fR
.fi

.LP
.nf
\fBzfs\fR \fBshare\fR \fB-a\fR | \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBunshare\fR \fB-a\fR \fIfilesystem\fR|\fImountpoint\fR
.fi

.LP
.nf
\fBzfs\fR \fBsend\fR [\fB-DvRp\fR] [\fB-\fR[\fBiI\fR] \fIsnapshot\fR] \fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBreceive\fR [\fB-vnFu\fR] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR
.fi

.LP
.nf
\fBzfs\fR \fBreceive\fR [\fB-vnFu\fR] [\fB-d\fR | \fB-e\fR] \fIfilesystem\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR [\fB-ldug\fR] "\fIeveryone\fR"|\fIuser\fR|\fIgroup\fR[,...] \fIperm\fR|\fI@setname\fR[,...] 
     \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR [\fB-ld\fR] \fB-e\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR \fB-c\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBallow\fR \fB-s\fR @\fIsetname\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBunallow\fR [\fB-rldug\fR] "\fIeveryone\fR"|\fIuser\fR|\fIgroup\fR[,...] [\fIperm\fR|@\fIsetname\fR[,... ]] 
     \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBunallow\fR [\fB-rld\fR] \fB-e\fR [\fIperm\fR|@\fIsetname\fR[,... ]] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBunallow\fR [\fB-r\fR] \fB-c\fR [\fIperm\fR|@\fIsetname\fR[ ... ]] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBunallow\fR [\fB-r\fR] \fB-s\fR @\fIsetname\fR [\fIperm\fR|@\fIsetname\fR[,... ]] \fIfilesystem\fR|\fIvolume\fR
.fi

.LP
.nf
\fBzfs\fR \fBhold\fR [\fB-r\fR] \fItag\fR \fIsnapshot\fR...
.fi

.LP
.nf
\fBzfs\fR \fBholds\fR [\fB-r\fR] \fIsnapshot\fR...
.fi

.LP
.nf
\fBzfs\fR \fBrelease\fR [\fB-r\fR] \fItag\fR \fIsnapshot\fR...
.fi

.SH DESCRIPTION
.sp
.LP
The \fBzfs\fR command configures \fBZFS\fR datasets within a \fBZFS\fR storage pool, as described in \fBzpool\fR(1M). A dataset is identified by a unique path within the \fBZFS\fR namespace. For example:
.sp
.in +2
.nf
pool/{filesystem,volume,snapshot}
.fi
.in -2
.sp

.sp
.LP
where the maximum length of a dataset name is \fBMAXNAMELEN\fR (256 bytes).
.sp
.LP
A dataset can be one of the following:
.sp
.ne 2
.mk
.na
\fB\fIfile system\fR\fR
.ad
.sp .6
.RS 4n
A \fBZFS\fR dataset of type \fBfilesystem\fR can be mounted within the standard system namespace and behaves like other file systems. While \fBZFS\fR file systems are designed to be \fBPOSIX\fR compliant, known issues exist that prevent compliance in some cases. Applications that depend on standards conformance might fail due to nonstandard behavior when checking file system free space.
.RE

.sp
.ne 2
.mk
.na
\fB\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
A logical volume exported as a raw or block device. This type of dataset should only be used under special circumstances. File systems are typically used in most environments.
.RE

.sp
.ne 2
.mk
.na
\fB\fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
A read-only version of a file system or volume at a given point in time. It is specified as \fIfilesystem@name\fR or \fIvolume@name\fR.
.RE

.SS "ZFS File System Hierarchy"
.sp
.LP
A \fBZFS\fR storage pool is a logical collection of devices that provide space for datasets. A storage pool is also the root of the \fBZFS\fR file system hierarchy.
.sp
.LP
The root of the pool can be accessed as a file system, such as mounting and unmounting, taking snapshots, and setting properties. The physical storage characteristics, however, are managed by the \fBzpool\fR(1M) command.
.sp
.LP
See \fBzpool\fR(1M) for more information on creating and administering pools.
.SS "Snapshots"
.sp
.LP
A snapshot is a read-only copy of a file system or volume. Snapshots can be created extremely quickly, and initially consume no additional space within the pool. As data within the active dataset changes, the snapshot consumes more data than would otherwise be shared with the active dataset.
.sp
.LP
Snapshots can have arbitrary names. Snapshots of volumes can be cloned or rolled back, but cannot be accessed independently.
.sp
.LP
File system snapshots can be accessed under the \fB\&.zfs/snapshot\fR directory in the root of the file system. Snapshots are automatically mounted on demand and may be unmounted at regular intervals. The visibility of the \fB\&.zfs\fR directory can be controlled by the \fBsnapdir\fR property.
.SS "Clones"
.sp
.LP
A clone is a writable volume or file system whose initial contents are the same as another dataset. As with snapshots, creating a clone is nearly instantaneous, and initially consumes no additional space.
.sp
.LP
Clones can only be created from a snapshot. When a snapshot is cloned, it creates an implicit dependency between the parent and child. Even though the clone is created somewhere else in the dataset hierarchy, the original snapshot cannot be destroyed as long as a clone exists. The \fBorigin\fR property exposes this dependency, and the \fBdestroy\fR command lists any such dependencies, if they exist.
.sp
.LP
The clone parent-child dependency relationship can be reversed by using the \fBpromote\fR subcommand. This causes the "origin" file system to become a clone of the specified file system, which makes it possible to destroy the file system that the clone was created from.
.SS "Mount Points"
.sp
.LP
Creating a \fBZFS\fR file system is a simple operation, so the number of file systems per system is likely to be numerous. To cope with this, \fBZFS\fR automatically manages mounting and unmounting file systems without the need to edit the \fB/etc/vfstab\fR file. All automatically managed file systems are mounted by \fBZFS\fR at boot time.
.sp
.LP
By default, file systems are mounted under \fB/\fIpath\fR\fR, where \fIpath\fR is the name of the file system in the \fBZFS\fR namespace. Directories are created and destroyed as needed.
.sp
.LP
A file system can also have a mount point set in the \fBmountpoint\fR property. This directory is created as needed, and \fBZFS\fR automatically mounts the file system when the \fBzfs mount -a\fR command is invoked (without editing \fB/etc/vfstab\fR). The \fBmountpoint\fR property can be inherited, so if \fBpool/home\fR has a mount point of \fB/export/stuff\fR, then \fBpool/home/user\fR automatically inherits a mount point of \fB/export/stuff/user\fR.
.sp
.LP
A file system \fBmountpoint\fR property of \fBnone\fR prevents the file system from being mounted.
.sp
.LP
If needed, \fBZFS\fR file systems can also be managed with traditional tools (\fBmount\fR, \fBumount\fR, \fB/etc/vfstab\fR). If a file system's mount point is set to \fBlegacy\fR, \fBZFS\fR makes no attempt to manage the file system, and the administrator is responsible for mounting and unmounting the file system.
.SS "Zones"
.sp
.LP
A \fBZFS\fR file system can be added to a non-global zone by using the \fBzonecfg\fR \fBadd fs\fR subcommand. A \fBZFS\fR file system that is added to a non-global zone must have its \fBmountpoint\fR property set to \fBlegacy\fR.
.sp
.LP
The physical properties of an added file system are controlled by the global administrator. However, the zone administrator can create, modify, or destroy files within the added file system, depending on how the file system is mounted.
.sp
.LP
A dataset can also be delegated to a non-global zone by using the \fBzonecfg\fR \fBadd dataset\fR subcommand. You cannot delegate a dataset to one zone and the children of the same dataset to another zone. The zone administrator can change properties of the dataset or any of its children. However, the \fBquota\fR property is controlled by the global administrator.
.sp
.LP
A \fBZFS\fR volume can be added as a device to a non-global zone by using the \fBzonecfg\fR \fBadd device\fR subcommand. However, its physical properties can be modified only by the global administrator.
.sp
.LP
For more information about \fBzonecfg\fR syntax, see \fBzonecfg\fR(1M).
.sp
.LP
After a dataset is delegated to a non-global zone, the \fBzoned\fR property is automatically set. A zoned file system cannot be mounted in the global zone, since the zone administrator might have to set the mount point to an unacceptable value.
.sp
.LP
The global administrator can forcibly clear the \fBzoned\fR property, though this should be done with extreme care. The global administrator should verify that all the mount points are acceptable before clearing the property.
.SS "Deduplication"
.sp
.LP
Deduplication is the process for removing redundant data at  the block-level, reducing the total amount of data stored. If a file system has the \fBdedup\fR  property enabled, duplicate data blocks are removed synchronously.  The result is that only unique data is stored and common components are shared among files.
.SS "Native Properties"
.sp
.LP
Properties are divided into two types, native properties and user-defined (or "user") properties. Native properties either export internal statistics or control \fBZFS\fR behavior. In addition, native properties are either editable or read-only. User properties have no effect on \fBZFS\fR behavior, but you can use them to annotate datasets in a way that is meaningful in your environment. For more information about user properties, see the "User Properties" section, below.
.sp
.LP
Every dataset has a set of properties that export statistics about the dataset as well as control various behaviors. Properties are inherited from the parent unless overridden by the child. Some properties apply only to certain types of datasets (file systems, volumes, or snapshots).
.sp
.LP
The values of numeric properties can be specified using human-readable suffixes (for example, \fBk\fR, \fBKB\fR, \fBM\fR, \fBGb\fR, and so forth, up to \fBZ\fR for zettabyte). The following are all valid (and equal) specifications: 
.sp
.in +2
.nf
1536M, 1.5g, 1.50GB
.fi
.in -2
.sp

.sp
.LP
The values of non-numeric properties are case sensitive and must be lowercase, except for \fBmountpoint\fR, \fBsharenfs\fR, and \fBsharesmb\fR.
.sp
.LP
The following native properties consist of read-only statistics about the dataset. These properties can be neither set, nor inherited. Native properties apply to all dataset types unless otherwise noted.
.sp
.ne 2
.mk
.na
\fB\fBavailable\fR\fR
.ad
.sp .6
.RS 4n
The amount of space available to the dataset and all its children, assuming that there is no other activity in the pool. Because space is shared within a pool, availability can be limited by any number of factors, including physical pool size, quotas, reservations, or other datasets within the pool.
.sp
This property can also be referred to by its shortened column name, \fBavail\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBcompressratio\fR\fR
.ad
.sp .6
.RS 4n
The compression ratio achieved for this dataset, expressed as a multiplier. Compression can be turned on by running: \fBzfs set compression=on \fIdataset\fR\fR. The default value is \fBoff\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBcreation\fR\fR
.ad
.sp .6
.RS 4n
The time this dataset was created.
.RE

.sp
.ne 2
.mk
.na
\fB\fBdefer_destroy\fR\fR
.ad
.sp .6
.RS 4n
This property is \fBon\fR if the snapshot has been marked for deferred destroy by using the \fBzfs destroy\fR \fB-d\fR command. Otherwise, the property is \fBoff\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBmounted\fR\fR
.ad
.sp .6
.RS 4n
For file systems, indicates whether the file system is currently mounted. This property can be either \fByes\fR or \fBno\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBorigin\fR\fR
.ad
.sp .6
.RS 4n
For cloned file systems or volumes, the snapshot from which the clone was created. The origin cannot be destroyed (even with the \fB-r\fR or \fB-f\fR options) so long as a clone exists.
.RE

.sp
.ne 2
.mk
.na
\fB\fBreferenced\fR\fR
.ad
.sp .6
.RS 4n
The amount of data that is accessible by this dataset, which may or may not be shared with other datasets in the pool. When a snapshot or clone is created, it initially references the same amount of space as the file system or snapshot it was created from, since its contents are identical.
.sp
This property can also be referred to by its shortened column name, \fBrefer\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBtype\fR\fR
.ad
.sp .6
.RS 4n
The type of dataset: \fBfilesystem\fR, \fBvolume\fR, or \fBsnapshot\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBused\fR\fR
.ad
.sp .6
.RS 4n
The amount of space consumed by this dataset and all its descendents. This is the value that is checked against this dataset's quota and reservation. The space used does not include this dataset's reservation, but does take into account the reservations of any descendent datasets. The amount of space that a dataset consumes from its parent, as well as the amount of space that are freed if this dataset is recursively destroyed, is the greater of its space used and its reservation.
.sp
When snapshots (see the "Snapshots" section) are created, their space is initially shared between the snapshot and the file system, and possibly with previous snapshots. As the file system changes, space that was previously shared becomes unique to the snapshot, and counted in the snapshot's space used. Additionally, deleting snapshots can increase the amount of space unique to (and used by) other snapshots.
.sp
The amount of space used, available, or referenced does not take into account pending changes. Pending changes are generally accounted for within a few seconds. Committing a change to a disk using \fBfsync\fR(3c) or \fBO_SYNC\fR does not necessarily guarantee that the space usage information is updated immediately.
.RE

.sp
.ne 2
.mk
.na
\fB\fBusedby*\fR\fR
.ad
.sp .6
.RS 4n
The \fBusedby*\fR properties decompose the \fBused\fR properties into the various reasons that space is used. Specifically, \fBused\fR = \fBusedbychildren\fR + \fBusedbydataset\fR + \fBusedbyrefreservation\fR +, \fBusedbysnapshots\fR. These properties are only available for datasets created on \fBzpool\fR "version 13" pools.
.RE

.sp
.ne 2
.mk
.na
\fB\fBusedbychildren\fR\fR
.ad
.sp .6
.RS 4n
The amount of space used by children of this dataset, which would be freed if all the dataset's children were destroyed.
.RE

.sp
.ne 2
.mk
.na
\fB\fBusedbydataset\fR\fR
.ad
.sp .6
.RS 4n
The amount of space used by this dataset itself, which would be freed if the dataset were destroyed (after first removing any \fBrefreservation\fR and destroying any necessary snapshots or descendents).
.RE

.sp
.ne 2
.mk
.na
\fB\fBusedbyrefreservation\fR\fR
.ad
.sp .6
.RS 4n
The amount of space used by a \fBrefreservation\fR set on this dataset, which would be freed if the \fBrefreservation\fR was removed.
.RE

.sp
.ne 2
.mk
.na
\fB\fBusedbysnapshots\fR\fR
.ad
.sp .6
.RS 4n
The amount of space consumed by snapshots of this dataset. In particular, it is the amount of space that would be freed if all of this dataset's snapshots were destroyed. Note that this is not simply the sum of the snapshots' \fBused\fR properties because space can be shared by multiple snapshots.
.RE

.sp
.ne 2
.mk
.na
\fB\fBuserused@\fR\fIuser\fR\fR
.ad
.sp .6
.RS 4n
The amount of space consumed by the specified user in this dataset. Space is charged to the owner of each file, as displayed by \fBls\fR \fB-l\fR. The amount of space charged is displayed by \fBdu\fR and \fBls\fR \fB-s\fR. See the \fBzfs userspace\fR subcommand for more information.
.sp
Unprivileged users can access only their own space usage. The root user, or a user who has been granted the \fBuserused\fR privilege with \fBzfs allow\fR, can access everyone's usage.
.sp
The \fBuserused@\fR... properties are not displayed by \fBzfs get all\fR. The user's name must be appended after the \fB@\fR symbol, using one of the following forms:
.RS +4
.TP
.ie t \(bu
.el o
\fIPOSIX name\fR (for example, \fBjoe\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fIPOSIX numeric ID\fR (for example, \fB789\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fISID name\fR (for example, \fBjoe.smith@mydomain\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fISID numeric ID\fR (for example, \fBS-1-123-456-789\fR)
.RE
.RE

.sp
.ne 2
.mk
.na
\fB\fBuserrefs\fR\fR
.ad
.sp .6
.RS 4n
This property is set to the number of user holds on this snapshot. User holds are set by using the \fBzfs hold\fR command.
.RE

.sp
.ne 2
.mk
.na
\fB\fBgroupused@\fR\fIgroup\fR\fR
.ad
.sp .6
.RS 4n
The amount of space consumed by the specified group in this dataset. Space is charged to the group of each file, as displayed by \fBls\fR \fB-l\fR. See the \fBuserused@\fR\fIuser\fR property for more information.
.sp
Unprivileged users can only access their own groups' space usage. The root user, or a user who has been granted the \fBgroupused\fR privilege with \fBzfs allow\fR, can access all groups' usage.
.RE

.sp
.ne 2
.mk
.na
\fB\fBvolblocksize\fR=\fIblocksize\fR\fR
.ad
.sp .6
.RS 4n
For volumes, specifies the block size of the volume. The \fBblocksize\fR cannot be changed once the volume has been written, so it should be set at volume creation time. The default \fBblocksize\fR for volumes is 8 Kbytes. Any power of 2 from 512 bytes to 128 Kbytes is valid.
.sp
This property can also be referred to by its shortened column name, \fBvolblock\fR.
.RE

.sp
.LP
The following native properties can be used to change the behavior of a \fBZFS\fR dataset.
.sp
.ne 2
.mk
.na
\fB\fBaclinherit\fR=\fBdiscard\fR | \fBnoallow\fR | \fBrestricted\fR | \fBpassthrough\fR | \fBpassthrough-x\fR\fR
.ad
.sp .6
.RS 4n
Controls how \fBACL\fR entries are inherited when files and directories are created. A file system with an \fBaclinherit\fR property of \fBdiscard\fR does not inherit any \fBACL\fR entries. A file system with an \fBaclinherit\fR property value of \fBnoallow\fR only inherits inheritable \fBACL\fR entries that specify "deny" permissions. The property value \fBrestricted\fR (the default) removes the \fBwrite_acl\fR and \fBwrite_owner\fR permissions when the \fBACL\fR entry is inherited. A file system with an \fBaclinherit\fR property value of \fBpassthrough\fR inherits all inheritable \fBACL\fR entries without any modifications made to the \fBACL\fR entries when they are inherited. A file system with an \fBaclinherit\fR property value of \fBpassthrough-x\fR has the same meaning as \fBpassthrough\fR, except that the \fBowner@\fR, \fBgroup@\fR, and \fBeveryone@\fR \fBACE\fRs inherit the execute permission only if the file creation mode also requests the execute bit.
.sp
When the property value is set to \fBpassthrough\fR, files are created with a mode determined by the inheritable \fBACE\fRs. If no inheritable \fBACE\fRs exist that affect the mode, then the mode is set in accordance to the requested mode from the application.
.RE

.sp
.ne 2
.mk
.na
\fB\fBaclmode\fR=\fBdiscard\fR | \fBgroupmask\fR | \fBpassthrough\fR\fR
.ad
.sp .6
.RS 4n
Controls how an \fBACL\fR is modified during \fBchmod\fR(2). A file system with an \fBaclmode\fR property of \fBdiscard\fR deletes all \fBACL\fR entries that do not represent the mode of the file. An \fBaclmode\fR property of \fBgroupmask\fR (the default) reduces user or group permissions. The permissions are reduced, such that they are no greater than the group permission bits, unless it is a user entry that has the same \fBUID\fR as the owner of the file or directory. In this case, the \fBACL\fR permissions are reduced so that they are no greater than owner permission bits. A file system with an \fBaclmode\fR property of \fBpassthrough\fR indicates that no changes are made to the \fBACL\fR other than generating the necessary \fBACL\fR entries to represent the new mode of the file or directory.
.RE

.sp
.ne 2
.mk
.na
\fB\fBatime\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the access time for files is updated when they are read. Turning this property off avoids producing write traffic when reading files and can result in significant performance gains, though it might confuse mailers and other similar utilities. The default value is \fBon\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBcanmount\fR=\fBon\fR | \fBoff\fR | \fBnoauto\fR\fR
.ad
.sp .6
.RS 4n
If this property is set to \fBoff\fR, the file system cannot be mounted, and is ignored by \fBzfs mount -a\fR. Setting this property to \fBoff\fR is similar to setting the \fBmountpoint\fR property to \fBnone\fR, except that the dataset still has a normal \fBmountpoint\fR property, which can be inherited. Setting this property to \fBoff\fR allows datasets to be used solely as a mechanism to inherit properties. One example of setting \fBcanmount=\fR\fBoff\fR is to have two datasets with the same \fBmountpoint\fR, so that the children of both datasets appear in the same directory, but might have different inherited characteristics.
.sp
When the \fBnoauto\fR option is set, a dataset can only be mounted and unmounted explicitly. The dataset is not mounted automatically when the dataset is created or imported, nor is it mounted by the \fBzfs mount -a\fR command or unmounted by the \fBzfs unmount -a\fR command.
.sp
This property is not inherited.
.RE

.sp
.ne 2
.mk
.na
\fB\fBchecksum\fR=\fBon\fR | \fBoff\fR | \fBfletcher2,\fR| \fBfletcher4\fR | \fBsha256\fR\fR
.ad
.sp .6
.RS 4n
Controls the checksum used to verify data integrity. The default value is \fBon\fR, which automatically selects an appropriate algorithm (currently, \fBfletcher4\fR, but this may change in future releases). The value \fBoff\fR disables integrity checking on user data. Disabling checksums is \fBNOT\fR a recommended practice.
.sp
Changing this property affects only newly-written data.
.RE

.sp
.ne 2
.mk
.na
\fB\fBcompression\fR=\fBon\fR | \fBoff\fR | \fBlzjb\fR | \fBgzip\fR | \fBgzip-\fR\fIN\fR | \fBzle\fR\fR
.ad
.sp .6
.RS 4n
Controls the compression algorithm used for this dataset. The \fBlzjb\fR compression algorithm is optimized for performance while providing decent data compression. Setting compression to \fBon\fR uses the \fBlzjb\fR compression algorithm. The \fBgzip\fR compression algorithm uses the same compression as the \fBgzip\fR(1) command. You can specify the \fBgzip\fR level by using the value \fBgzip-\fR\fIN\fR where \fIN\fR is an integer from 1 (fastest) to 9 (best compression ratio). Currently, \fBgzip\fR is equivalent to \fBgzip-6\fR (which is also the default for \fBgzip\fR(1)).
.sp
This property can also be referred to by its shortened column name \fBcompress\fR. Changing this property affects only newly-written data.
.RE

.sp
.ne 2
.mk
.na
\fB\fBcopies\fR=\fB1\fR | \fB2\fR | \fB3\fR\fR
.ad
.sp .6
.RS 4n
Controls the number of copies of data stored for this dataset. These copies are in addition to any redundancy provided by the pool, for example, mirroring or RAID-Z. The copies are stored on different disks, if possible. The space used by multiple copies is charged to the associated file and dataset, changing the \fBused\fR property and counting against quotas and reservations.
.sp
Changing this property only affects newly-written data. Therefore, set this property at file system creation time by using the \fB-o\fR \fBcopies=\fR\fIN\fR option.
.RE

.sp
.ne 2
.mk
.na
\fB\fBdedup\fR=\fBon\fR | \fBoff\fR | \fBverify\fR | \fBsha256\fR[,\fBverify\fR]\fR
.ad
.sp .6
.RS 4n
Controls whether deduplication is in effect for a dataset. The default value is \fBoff\fR. The default checksum used for deduplication is \fBsha256\fR (subject to change). When \fBdedup\fR is enabled, the \fBdedup\fR checksum algorithm overrides the \fBchecksum\fR property. Setting the value to \fBverify\fR is equivalent to specifying \fBsha256,verify\fR.
.sp
If the property is set to \fBverify\fR, then, whenever two blocks have the same signature, ZFS will do a byte-for-byte comparison with the existing block to ensure that the contents are identical.
.RE

.sp
.ne 2
.mk
.na
\fB\fBdevices\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether device nodes can be opened on this file system. The default value is \fBon\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBexec\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether processes can be executed from within this file system. The default value is \fBon\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBmlslabel\fR=\fIlabel\fR | \fBnone\fR\fR
.ad
.sp .6
.RS 4n
The \fBmlslabel\fR property is a sensitivity label that determines if a dataset  can be mounted in a zone on a system with Trusted Extensions enabled. If the labeled dataset matches the labeled zone, the dataset can be mounted  and accessed from the labeled zone.
.sp
When the \fBmlslabel\fR property is not set, the default value is \fBnone\fR. Setting the  \fBmlslabel\fR property to \fBnone\fR is equivalent to removing the property.
.sp
The \fBmlslabel\fR property can be modified only when Trusted Extensions is enabled and only with appropriate privilege. Rights to modify it cannot be delegated. When changing a label to a higher label or setting the initial dataset label, the \fB{PRIV_FILE_UPGRADE_SL}\fR privilege is required. When changing a label to a lower label or the default (\fBnone\fR), the \fB{PRIV_FILE_DOWNGRADE_SL}\fR privilege is required. Changing the dataset to labels other than the default can be done only when the dataset is not mounted. When a dataset with the default label is mounted into a labeled-zone, the mount operation automatically sets the \fBmlslabel\fR property to the label of that zone.
.sp
When Trusted Extensions is \fBnot\fR enabled, only datasets with the default label (\fBnone\fR) can be mounted.
.RE

.sp
.ne 2
.mk
.na
\fB\fBmountpoint\fR=\fIpath\fR | \fBnone\fR | \fBlegacy\fR\fR
.ad
.sp .6
.RS 4n
Controls the mount point used for this file system. See the "Mount Points" section for more information on how this property is used. 
.sp
When the \fBmountpoint\fR property is changed for a file system, the file system and any children that inherit the mount point are unmounted. If the new value is \fBlegacy\fR, then they remain unmounted. Otherwise, they are automatically remounted in the new location if the property was previously \fBlegacy\fR or \fBnone\fR, or if they were mounted before the property was changed. In addition, any shared file systems are unshared and shared in the new location.
.RE

.sp
.ne 2
.mk
.na
\fB\fBnbmand\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the file system should be mounted with \fBnbmand\fR (Non Blocking mandatory locks). This is used for \fBCIFS\fR clients. Changes to this property only take effect when the file system is umounted and remounted. See \fBmount\fR(1M) for more information on \fBnbmand\fR mounts.
.RE

.sp
.ne 2
.mk
.na
\fB\fBprimarycache\fR=\fBall\fR | \fBnone\fR | \fBmetadata\fR\fR
.ad
.sp .6
.RS 4n
Controls what is cached in the primary cache (ARC). If this property is set to \fBall\fR, then both user data and metadata is cached. If this property is set to \fBnone\fR, then neither user data nor metadata is cached. If this property is set to \fBmetadata\fR, then only metadata is cached. The default value is \fBall\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBquota\fR=\fIsize\fR | \fBnone\fR\fR
.ad
.sp .6
.RS 4n
Limits the amount of space a dataset and its descendents can consume. This property enforces a hard limit on the amount of space used. This includes all space consumed by descendents, including file systems and snapshots. Setting a quota on a descendent of a dataset that already has a quota does not override the ancestor's quota, but rather imposes an additional limit.
.sp
Quotas cannot be set on volumes, as the \fBvolsize\fR property acts as an implicit quota.
.RE

.sp
.ne 2
.mk
.na
\fB\fBuserquota@\fR\fIuser\fR=\fIsize\fR | \fBnone\fR\fR
.ad
.sp .6
.RS 4n
Limits the amount of space consumed by the specified user. Similar to the \fBrefquota\fR property, the \fBuserquota\fR space calculation does not include space that is used by descendent datasets, such as snapshots and clones. User space consumption is identified by the \fBuserspace@\fR\fIuser\fR property.
.sp
Enforcement of user quotas may be delayed by several seconds. This delay means that a user might exceed her quota before the system notices that she is over quota. The system would then begin to refuse additional writes with the \fBEDQUOT\fR error message . See the \fBzfs userspace\fR subcommand for more information.
.sp
Unprivileged users can only access their own groups' space usage. The root user, or a user who has been granted the \fBuserquota\fR privilege with \fBzfs allow\fR, can get and set everyone's quota.
.sp
This property is not available on volumes, on file systems before version 4, or on pools before version 15. The \fBuserquota@\fR... properties are not displayed by \fBzfs get all\fR. The user's name must be appended after the \fB@\fR symbol, using one of the following forms:
.RS +4
.TP
.ie t \(bu
.el o
\fIPOSIX name\fR (for example, \fBjoe\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fIPOSIX numeric ID\fR (for example, \fB789\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fISID name\fR (for example, \fBjoe.smith@mydomain\fR)
.RE
.RS +4
.TP
.ie t \(bu
.el o
\fISID numeric ID\fR (for example, \fBS-1-123-456-789\fR)
.RE
.RE

.sp
.ne 2
.mk
.na
\fB\fBgroupquota@\fR\fIgroup\fR=\fIsize\fR | \fBnone\fR\fR
.ad
.sp .6
.RS 4n
Limits the amount of space consumed by the specified group. Group space consumption is identified by the \fBuserquota@\fR\fIuser\fR property.
.sp
Unprivileged users can access only their own groups' space usage. The root user, or a user who has been granted the \fBgroupquota\fR privilege with \fBzfs allow\fR, can get and set all groups' quotas.
.RE

.sp
.ne 2
.mk
.na
\fB\fBreadonly\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether this dataset can be modified. The default value is \fBoff\fR.
.sp
This property can also be referred to by its shortened column name, \fBrdonly\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBrecordsize\fR=\fIsize\fR\fR
.ad
.sp .6
.RS 4n
Specifies a suggested block size for files in the file system. This property is designed solely for use with database workloads that access files in fixed-size records. \fBZFS\fR automatically tunes block sizes according to internal algorithms optimized for typical access patterns. 
.sp
For databases that create very large files but access them in small random chunks, these algorithms may be suboptimal. Specifying a \fBrecordsize\fR greater than or equal to the record size of the database can result in significant performance gains. Use of this property for general purpose file systems is strongly discouraged, and may adversely affect performance.
.sp
The size specified must be a power of two greater than or equal to 512 and less than or equal to 128 Kbytes.
.sp
Changing the file system's \fBrecordsize\fR affects only files created afterward; existing files are unaffected.
.sp
This property can also be referred to by its shortened column name, \fBrecsize\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBrefquota\fR=\fIsize\fR | \fBnone\fR\fR
.ad
.sp .6
.RS 4n
Limits the amount of space a dataset can consume. This property enforces a hard limit on the amount of space used. This hard limit does not include space used by descendents, including file systems and snapshots.
.RE

.sp
.ne 2
.mk
.na
\fB\fBrefreservation\fR=\fIsize\fR | \fBnone\fR\fR
.ad
.sp .6
.RS 4n
The minimum amount of space guaranteed to a dataset, not including its descendents. When the amount of space used is below this value, the dataset is treated as if it were taking up the amount of space specified by \fBrefreservation\fR. The \fBrefreservation\fR reservation is accounted for in the parent datasets' space used, and counts against the parent datasets' quotas and reservations.
.sp
If \fBrefreservation\fR is set, a snapshot is only allowed if there is enough free pool space outside of this reservation to accommodate the current number of "referenced" bytes in the dataset.
.sp
This property can also be referred to by its shortened column name, \fBrefreserv\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBreservation\fR=\fIsize\fR | \fBnone\fR\fR
.ad
.sp .6
.RS 4n
The minimum amount of space guaranteed to a dataset and its descendents. When the amount of space used is below this value, the dataset is treated as if it were taking up the amount of space specified by its reservation. Reservations are accounted for in the parent datasets' space used, and count against the parent datasets' quotas and reservations.
.sp
This property can also be referred to by its shortened column name, \fBreserv\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBsecondarycache\fR=\fBall\fR | \fBnone\fR | \fBmetadata\fR\fR
.ad
.sp .6
.RS 4n
Controls what is cached in the secondary cache (L2ARC). If this property is set to \fBall\fR, then both user data and metadata is cached. If this property is set to \fBnone\fR, then neither user data nor metadata is cached. If this property is set to \fBmetadata\fR, then only metadata is cached. The default value is \fBall\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBsetuid\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the set-\fBUID\fR bit is respected for the file system. The default value is \fBon\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBshareiscsi\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Like the \fBsharenfs\fR property, \fBshareiscsi\fR indicates whether a \fBZFS\fR volume is exported as an \fBiSCSI\fR target. The acceptable values for this property are \fBon\fR, \fBoff\fR, and \fBtype=disk\fR. The default value is \fBoff\fR. In the future, other target types might be supported. For example, \fBtape\fR.
.sp
You might want to set \fBshareiscsi=on\fR for a file system so that all \fBZFS\fR volumes within the file system are shared by default. However, setting this property on a file system has no direct effect.
.RE

.sp
.ne 2
.mk
.na
\fB\fBsharesmb\fR=\fBon\fR | \fBoff\fR | \fIopts\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the file system is shared by using the Solaris \fBCIFS\fR service, and what options are to be used. A file system with the \fBsharesmb\fR property set to \fBoff\fR is managed through traditional tools such as \fBsharemgr\fR(1M). Otherwise, the file system is automatically shared and unshared with the \fBzfs share\fR and \fBzfs unshare\fR commands. If the property is set to \fBon\fR, the \fBsharemgr\fR(1M) command is invoked with no options. Otherwise, the \fBsharemgr\fR(1M) command is invoked with options equivalent to the contents of this property.
.sp
Because \fBSMB\fR shares requires a resource name, a unique resource name is constructed from the dataset name. The constructed name is a copy of the dataset name except that the characters in the dataset name, which would be illegal in the resource name, are replaced with underscore (\fB_\fR) characters. A pseudo property "name" is also supported that allows you to replace the data set name with a specified name. The specified name is then used to replace the prefix dataset in the case of inheritance. For example, if the dataset \fBdata/home/john\fR is set to \fBname=john\fR, then \fBdata/home/john\fR has a resource name of \fBjohn\fR. If a child dataset of \fBdata/home/john/backups\fR, it has a resource name of \fBjohn_backups\fR.
.sp
When SMB shares are created, the SMB share name appears as an entry in the \fB\&.zfs/shares\fR directory. You can use the \fBls\fR or \fBchmod\fR command to display the share-level ACLs on the entries in this directory.
.sp
When the \fBsharesmb\fR property is changed for a dataset, the dataset and any children inheriting the property are re-shared with the new options, only if the property was previously set to \fBoff\fR, or if they were shared before the property was changed. If the new property is set to \fBoff\fR, the file systems are unshared.
.RE

.sp
.ne 2
.mk
.na
\fB\fBsharenfs\fR=\fBon\fR | \fBoff\fR | \fIopts\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the file system is shared via \fBNFS\fR, and what options are used. A file system with a \fBsharenfs\fR property of \fBoff\fR is managed through traditional tools such as \fBshare\fR(1M), \fBunshare\fR(1M), and \fBdfstab\fR(4). Otherwise, the file system is automatically shared and unshared with the \fBzfs share\fR and \fBzfs unshare\fR commands. If the property is set to \fBon\fR, the \fBshare\fR(1M) command is invoked with no options. Otherwise, the \fBshare\fR(1M) command is invoked with options equivalent to the contents of this property.
.sp
When the \fBsharenfs\fR property is changed for a dataset, the dataset and any children inheriting the property are re-shared with the new options, only if the property was previously \fBoff\fR, or if they were shared before the property was changed. If the new property is \fBoff\fR, the file systems are unshared.
.RE

.sp
.ne 2
.mk
.na
\fB\fBlogbias\fR = \fBlatency\fR | \fBthroughput\fR\fR
.ad
.sp .6
.RS 4n
Provides a hint to ZFS about handling of synchronous requests in this dataset. If \fBlogbias\fR is set to \fBlatency\fR (the default), ZFS uses the pool's log devices (if configured) to handle the requests at low latency. If \fBlogbias\fR is set to \fBthroughput\fR, ZFS does not use the configured pool log devices. Instead, ZFS optimizes synchronous operations for global pool throughput and efficient use of resources.
.RE

.sp
.ne 2
.mk
.na
\fB\fBsnapdir\fR=\fBhidden\fR | \fBvisible\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the \fB\&.zfs\fR directory is hidden or visible in the root of the file system as discussed in the "Snapshots" section. The default value is \fBhidden\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBversion\fR=\fB1\fR | \fB2\fR | \fBcurrent\fR\fR
.ad
.sp .6
.RS 4n
The on-disk version of this file system, which is independent of the pool version. This property can only be set to later supported versions. See the \fBzfs upgrade\fR command.
.RE

.sp
.ne 2
.mk
.na
\fB\fBvolsize\fR=\fIsize\fR\fR
.ad
.sp .6
.RS 4n
For volumes, specifies the logical size of the volume. By default, creating a volume establishes a reservation of equal size. For storage pools with a version number of 9 or higher, a \fBrefreservation\fR is set instead. Any changes to \fBvolsize\fR are reflected in an equivalent change to the reservation (or \fBrefreservation\fR). The \fBvolsize\fR can only be set to a multiple of \fBvolblocksize\fR, and cannot be zero.
.sp
The reservation is kept equal to the volume's logical size to prevent unexpected behavior for consumers. Without the reservation, the volume could run out of space, resulting in undefined behavior or data corruption, depending on how the volume is used. These effects can also occur when the volume size is changed while it is in use (particularly when shrinking the size). Extreme care should be used when adjusting the volume size.
.sp
Though not recommended, a "sparse volume" (also known as "thin provisioning") can be created by specifying the \fB-s\fR option to the \fBzfs create -V\fR command, or by changing the reservation after the volume has been created. A "sparse volume" is a volume where the reservation is less then the volume size. Consequently, writes to a sparse volume can fail with \fBENOSPC\fR when the pool is low on space. For a sparse volume, changes to \fBvolsize\fR are not reflected in the reservation.
.RE

.sp
.ne 2
.mk
.na
\fB\fBvscan\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether regular files should be scanned for viruses when a file is opened and closed. In addition to enabling this property, the virus scan service must also be enabled for virus scanning to occur. The default value is \fBoff\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBxattr\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether extended attributes are enabled for this file system. The default value is \fBon\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzoned\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Controls whether the dataset is managed from a non-global zone. See the "Zones" section for more information. The default value is \fBoff\fR.
.RE

.sp
.LP
The following three properties cannot be changed after the file system is created, and therefore, should be set when the file system is created. If the properties are not set with the \fBzfs create\fR or \fBzpool create\fR commands, these properties are inherited from the parent dataset. If the parent dataset lacks these properties due to having been created prior to these features being supported, the new file system will have the default values for these properties.
.sp
.ne 2
.mk
.na
\fB\fBcasesensitivity\fR=\fBsensitive\fR | \fBinsensitive\fR | \fBmixed\fR\fR
.ad
.sp .6
.RS 4n
Indicates whether the file name matching algorithm used by the file system should be case-sensitive, case-insensitive, or allow a combination of both styles of matching. The default value for the \fBcasesensitivity\fR property is \fBsensitive\fR. Traditionally, UNIX and POSIX file systems have case-sensitive file names.
.sp
The \fBmixed\fR value for the \fBcasesensitivity\fR property indicates that the file system can support requests for both case-sensitive and case-insensitive matching behavior. Currently, case-insensitive matching behavior on a file system that supports mixed behavior is limited to the Solaris CIFS server product. For more information about the \fBmixed\fR value behavior, see the \fISolaris ZFS Administration Guide\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBnormalization\fR = \fBnone\fR | \fBformC\fR | \fBformD\fR | \fBformKC\fR | \fBformKD\fR\fR
.ad
.sp .6
.RS 4n
Indicates whether the file system should perform a \fBunicode\fR normalization of file names whenever two file names are compared, and which normalization algorithm should be used. File names are always stored unmodified, names are normalized as part of any comparison process. If this property is set to a legal value other than \fBnone\fR, and the \fButf8only\fR property was left unspecified, the \fButf8only\fR property is automatically set to \fBon\fR. The default value of the \fBnormalization\fR property is \fBnone\fR. This property cannot be changed after the file system is created.
.RE

.sp
.ne 2
.mk
.na
\fB\fButf8only\fR=\fBon\fR | \fBoff\fR\fR
.ad
.sp .6
.RS 4n
Indicates whether the file system should reject file names that include characters that are not present in the \fBUTF-8\fR character code set. If this property is explicitly set to \fBoff\fR, the normalization property must either not be explicitly set or be set to \fBnone\fR. The default value for the \fButf8only\fR property is \fBoff\fR. This property cannot be changed after the file system is created.
.RE

.sp
.LP
The \fBcasesensitivity\fR, \fBnormalization\fR, and \fButf8only\fR properties are also new permissions that can be assigned to non-privileged users by using the \fBZFS\fR delegated administration feature.
.SS "Temporary Mount Point Properties"
.sp
.LP
When a file system is mounted, either through \fBmount\fR(1M) for legacy mounts or the \fBzfs mount\fR command for normal file systems, its mount options are set according to its properties. The correlation between properties and mount options is as follows:
.sp
.in +2
.nf
    PROPERTY                MOUNT OPTION
     devices                 devices/nodevices
     exec                    exec/noexec
     readonly                ro/rw
     setuid                  setuid/nosetuid
     xattr                   xattr/noxattr
.fi
.in -2
.sp

.sp
.LP
In addition, these options can be set on a per-mount basis using the \fB-o\fR option, without affecting the property that is stored on disk. The values specified on the command line override the values stored in the dataset. The \fB-nosuid\fR option is an alias for \fBnodevices,nosetuid\fR. These properties are reported as "temporary" by the \fBzfs get\fR command. If the properties are changed while the dataset is mounted, the new setting overrides any temporary settings.
.SS "User Properties"
.sp
.LP
In addition to the standard native properties, \fBZFS\fR supports arbitrary user properties. User properties have no effect on \fBZFS\fR behavior, but applications or administrators can use them to annotate datasets (file systems, volumes, and snapshots).
.sp
.LP
User property names must contain a colon (\fB:\fR) character to distinguish them from native properties. They may contain lowercase letters, numbers, and the following punctuation characters: colon (\fB:\fR), dash (\fB-\fR), period (\fB\&.\fR), and underscore (\fB_\fR). The expected convention is that the property name is divided into two portions such as \fImodule\fR\fB:\fR\fIproperty\fR, but this namespace is not enforced by \fBZFS\fR. User property names can be at most 256 characters, and cannot begin with a dash (\fB-\fR).
.sp
.LP
When making programmatic use of user properties, it is strongly suggested to use a reversed \fBDNS\fR domain name for the \fImodule\fR component of property names to reduce the chance that two independently-developed packages use the same property name for different purposes. Property names beginning with \fBcom.sun\fR. are reserved for use by Sun Microsystems.
.sp
.LP
The values of user properties are arbitrary strings, are always inherited, and are never validated. All of the commands that operate on properties (\fBzfs list\fR, \fBzfs get\fR, \fBzfs set\fR, and so forth) can be used to manipulate both native properties and user properties. Use the \fBzfs inherit\fR command to clear a user property . If the property is not defined in any parent dataset, it is removed entirely. Property values are limited to 1024 characters.
.SS "ZFS Volumes as Swap or Dump Devices"
.sp
.LP
During an initial installation or a live upgrade from a \fBUFS\fR file system, a swap device and dump device are created on \fBZFS\fR volumes in the \fBZFS\fR root pool. By default, the swap area size is based on 1/2 the size of physical memory up to 2 Gbytes. The size of the dump device depends on the kernel's requirements at installation time. Separate \fBZFS\fR volumes must be used for the swap area and dump devices. Do not swap to a file on a \fBZFS\fR file system. A \fBZFS\fR swap file configuration is not supported. 
.sp
.LP
If you need to change your swap area or dump device after the system is installed or upgraded, use the \fBswap\fR(1M) and \fBdumpadm\fR(1M) commands. If you need to change the size of your swap area or dump device, see the \fISolaris ZFS Administration Guide\fR.
.SH SUBCOMMANDS
.sp
.LP
All subcommands that modify state are logged persistently to the pool in their original form.
.sp
.ne 2
.mk
.na
\fB\fBzfs ?\fR\fR
.ad
.sp .6
.RS 4n
Displays a help message.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs create\fR [\fB-p\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
Creates a new \fBZFS\fR file system. The file system is automatically mounted according to the \fBmountpoint\fR property inherited from the parent.
.sp
.ne 2
.mk
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Creates all the non-existing parent datasets. Datasets created in this manner are automatically mounted according to the \fBmountpoint\fR property inherited from their parent. Any property specified on the command line using the \fB-o\fR option is ignored. If the target filesystem already exists, the operation completes successfully.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-o\fR \fIproperty\fR=\fIvalue\fR\fR
.ad
.sp .6
.RS 4n
Sets the specified property as if the command \fBzfs set\fR \fIproperty\fR=\fIvalue\fR was invoked at the same time the dataset was created. Any editable \fBZFS\fR property can also be set at creation time. Multiple \fB-o\fR options can be specified. An error results if the same property is specified in multiple \fB-o\fR options.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs create\fR [\fB-ps\fR] [\fB-b\fR \fIblocksize\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fB-V\fR \fIsize\fR \fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Creates a volume of the given size. The volume is exported as a block device in \fB/dev/zvol/{dsk,rdsk}/\fR\fIpath\fR, where \fIpath\fR is the name of the volume in the \fBZFS\fR namespace. The size represents the logical size as exported by the device. By default, a reservation of equal size is created.
.sp
\fIsize\fR is automatically rounded up to the nearest 128 Kbytes to ensure that the volume has an integral number of blocks regardless of \fIblocksize\fR.
.sp
.ne 2
.mk
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Creates all the non-existing parent datasets. Datasets created in this manner are automatically mounted according to the \fBmountpoint\fR property inherited from their parent. Any property specified on the command line using the \fB-o\fR option is ignored. If the target filesystem already exists, the operation completes successfully.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-s\fR\fR
.ad
.sp .6
.RS 4n
Creates a sparse volume with no reservation. See \fBvolsize\fR in the Native Properties section for more information about sparse volumes.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-o\fR \fIproperty\fR=\fIvalue\fR\fR
.ad
.sp .6
.RS 4n
Sets the specified property as if the \fBzfs set\fR \fIproperty\fR=\fIvalue\fR command was invoked at the same time the dataset was created. Any editable \fBZFS\fR property can also be set at creation time. Multiple \fB-o\fR options can be specified. An error results if the same property is specified in multiple \fB-o\fR options.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-b\fR \fIblocksize\fR\fR
.ad
.sp .6
.RS 4n
Equivalent to \fB-o\fR \fBvolblocksize\fR=\fIblocksize\fR. If this option is specified in conjunction with \fB-o\fR \fBvolblocksize\fR, the resulting behavior is undefined.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs destroy\fR [\fB-rRf\fR] \fIfilesystem\fR|\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Destroys the given dataset. By default, the command unshares any file systems that are currently shared, unmounts any file systems that are currently mounted, and refuses to destroy a dataset that has active dependents (children or clones).
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively destroy all children.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-R\fR\fR
.ad
.sp .6
.RS 4n
Recursively destroy all dependents, including cloned file systems outside the target hierarchy.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-f\fR\fR
.ad
.sp .6
.RS 4n
Force an unmount of any file systems using the \fBunmount -f\fR command. This option has no effect on non-file systems or unmounted file systems.
.RE

Extreme care should be taken when applying either the \fB-r\fR or the \fB-f\fR options, as they can destroy large portions of a pool and cause unexpected behavior for mounted file systems in use. 
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs destroy\fR [\fB-rRd\fR] \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
The given snapshot is destroyed immediately if and only if the \fBzfs destroy\fR command without the \fB-d\fR option would have destroyed it. Such immediate destruction would occur, for example, if the snapshot had no clones and the user-initiated reference count were zero.
.sp
If the snapshot does not qualify for immediate destruction, it is marked for deferred deletion. In this state, it exists as a usable, visible snapshot until both of the preconditions listed above are met, at which point it is destroyed.
.sp
.ne 2
.mk
.na
\fB\fB-d\fR\fR
.ad
.sp .6
.RS 4n
Defer snapshot deletion.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Destroy (or mark for deferred deletion) all snapshots with this name in descendent file systems.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-R\fR\fR
.ad
.sp .6
.RS 4n
Recursively destroy all dependents.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs snapshot\fR [\fB-r\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIfilesystem@snapname\fR|\fIvolume@snapname\fR\fR
.ad
.sp .6
.RS 4n
Creates a snapshot with the given name. All previous modifications by successful system calls to the file system are part of the snapshot. See the "Snapshots" section for details.
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively create snapshots of all descendent datasets. Snapshots are taken atomically, so that all recursive snapshots correspond to the same moment in time.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-o\fR \fIproperty\fR=\fIvalue\fR\fR
.ad
.sp .6
.RS 4n
Sets the specified property; see \fBzfs create\fR for details.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs rollback\fR [\fB-rRf\fR] \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
Roll back the given dataset to a previous snapshot. When a dataset is rolled back, all data that has changed since the snapshot is discarded, and the dataset reverts to the state at the time of the snapshot. By default, the command refuses to roll back to a snapshot other than the most recent one. In order to do so, all intermediate snapshots must be destroyed by specifying the \fB-r\fR option.
.sp
The \fB-rR\fR options do not recursively destroy the child snapshots of a recursive snapshot. Only the top-level recursive snapshot is destroyed by either of these options. To completely roll back a recursive snapshot, you must rollback the individual child snapshots.
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively destroy any snapshots more recent than the one specified.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-R\fR\fR
.ad
.sp .6
.RS 4n
Recursively destroy any more recent snapshots, as well as any clones of those snapshots.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-f\fR\fR
.ad
.sp .6
.RS 4n
Used with the \fB-R\fR option to force an unmount of any clone file systems that are to be destroyed.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs clone\fR [\fB-p\fR] [\fB-o\fR \fIproperty\fR=\fIvalue\fR] ... \fIsnapshot\fR \fIfilesystem\fR|\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Creates a clone of the given snapshot. See the "Clones" section for details. The target dataset can be located anywhere in the \fBZFS\fR hierarchy, and is created as the same type as the original.
.sp
.ne 2
.mk
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Creates all the non-existing parent datasets. Datasets created in this manner are automatically mounted according to the \fBmountpoint\fR property inherited from their parent. If the target filesystem or volume already exists, the operation completes successfully.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-o\fR \fIproperty\fR=\fIvalue\fR\fR
.ad
.sp .6
.RS 4n
Sets the specified property; see \fBzfs create\fR for details.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs promote\fR \fIclone-filesystem\fR\fR
.ad
.sp .6
.RS 4n
Promotes a clone file system to no longer be dependent on its "origin" snapshot. This makes it possible to destroy the file system that the clone was created from. The clone parent-child dependency relationship is reversed, so that the origin file system becomes a clone of the specified file system. 
.sp
The snapshot that was cloned, and any snapshots previous to this snapshot, are now owned by the promoted clone. The space they use moves from the origin file system to the promoted clone, so enough space must be available to accommodate these snapshots. No new space is consumed by this operation, but the space accounting is adjusted. The promoted clone must not have any conflicting snapshot names of its own. The \fBrename\fR subcommand can be used to rename any conflicting snapshots.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs rename\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR\fR
.ad
.br
.na
\fB\fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR\fR
.ad
.br
.na
\fB\fBzfs rename\fR [\fB-p\fR] \fIfilesystem\fR|\fIvolume\fR \fIfilesystem\fR|\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Renames the given dataset. The new target can be located anywhere in the \fBZFS\fR hierarchy, with the exception of snapshots. Snapshots can only be renamed within the parent file system or volume. When renaming a snapshot, the parent file system of the snapshot does not need to be specified as part of the second argument. Renamed file systems can inherit new mount points, in which case they are unmounted and remounted at the new mount point.
.sp
.ne 2
.mk
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Creates all the nonexistent parent datasets. Datasets created in this manner are automatically mounted according to the \fBmountpoint\fR property inherited from their parent.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs rename\fR \fB-r\fR \fIsnapshot\fR \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
Recursively rename the snapshots of all descendent datasets. Snapshots are the only dataset that can be renamed recursively.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs\fR \fBlist\fR [\fB-r\fR|\fB-d\fR \fIdepth\fR] [\fB-H\fR] [\fB-o\fR \fIproperty\fR[,\fI\&...\fR]] [ \fB-t\fR \fItype\fR[,\fI\&...\fR]] [ \fB-s\fR \fIproperty\fR ] ... [ \fB-S\fR \fIproperty\fR ] ... [\fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR] ...\fR
.ad
.sp .6
.RS 4n
Lists the property information for the given datasets in tabular form. If specified, you can list property information by the absolute pathname or the relative pathname. By default, all file systems and volumes are displayed. Snapshots are displayed if the \fBlistsnaps\fR property is \fBon\fR (the default is \fBoff\fR) . The following fields are displayed, \fBname,used,available,referenced,mountpoint\fR.
.sp
.ne 2
.mk
.na
\fB\fB-H\fR\fR
.ad
.sp .6
.RS 4n
Used for scripting mode. Do not print headers and separate fields by a single tab instead of arbitrary white space.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively display any children of the dataset on the command line. 
.RE

.sp
.ne 2
.mk
.na
\fB\fB-d\fR \fIdepth\fR\fR
.ad
.sp .6
.RS 4n
Recursively display any children of the dataset, limiting the recursion to \fIdepth\fR. A depth of \fB1\fR will display only the dataset and its direct children.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-o\fR \fIproperty\fR\fR
.ad
.sp .6
.RS 4n
A comma-separated list of properties to display. The property must be:
.RS +4
.TP
.ie t \(bu
.el o
One of the properties described in the "Native Properties" section
.RE
.RS +4
.TP
.ie t \(bu
.el o
A user property
.RE
.RS +4
.TP
.ie t \(bu
.el o
The value \fBname\fR to display the dataset name
.RE
.RS +4
.TP
.ie t \(bu
.el o
The value \fBspace\fR to display space usage properties on file systems and volumes. This is a shortcut for specifying \fB-o name,avail,used,usedsnap,usedds,usedrefreserv,usedchild\fR \fB-t filesystem,volume\fR syntax.
.RE
.RE

.sp
.ne 2
.mk
.na
\fB\fB-s\fR \fIproperty\fR\fR
.ad
.sp .6
.RS 4n
A property for sorting the output by column in ascending order based on the value of the property. The property must be one of the properties described in the "Properties" section, or the special value \fBname\fR to sort by the dataset name. Multiple properties can be specified at one time using multiple \fB-s\fR property options. Multiple \fB-s\fR options are evaluated from left to right in decreasing order of importance.
.sp
The following is a list of sorting criteria:
.RS +4
.TP
.ie t \(bu
.el o
Numeric types sort in numeric order.
.RE
.RS +4
.TP
.ie t \(bu
.el o
String types sort in alphabetical order.
.RE
.RS +4
.TP
.ie t \(bu
.el o
Types inappropriate for a row sort that row to the literal bottom, regardless of the specified ordering.
.RE
.RS +4
.TP
.ie t \(bu
.el o
If no sorting options are specified the existing behavior of \fBzfs list\fR is preserved.
.RE
.RE

.sp
.ne 2
.mk
.na
\fB\fB-S\fR \fIproperty\fR\fR
.ad
.sp .6
.RS 4n
Same as the \fB-s\fR option, but sorts by property in descending order. 
.RE

.sp
.ne 2
.mk
.na
\fB\fB-t\fR \fItype\fR\fR
.ad
.sp .6
.RS 4n
A comma-separated list of types to display, where \fItype\fR is one of \fBfilesystem\fR, \fBsnapshot\fR , \fBvolume\fR, or \fBall\fR. For example, specifying \fB-t snapshot\fR displays only snapshots.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs set\fR \fIproperty\fR=\fIvalue\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR ...\fR
.ad
.sp .6
.RS 4n
Sets the property to the given value for each dataset. Only some properties can be edited. See the "Properties" section for more information on what properties can be set and acceptable values. Numeric values can be specified as exact values, or in a human-readable form with a suffix of \fBB\fR, \fBK\fR, \fBM\fR, \fBG\fR, \fBT\fR, \fBP\fR, \fBE\fR, \fBZ\fR (for bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, exabytes, or zettabytes, respectively). User properties can be set on snapshots. For more information, see the "User Properties" section.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs get\fR [\fB-r\fR|\fB-d\fR \fIdepth\fR] [\fB-Hp\fR] [\fB-o\fR \fBall\fR | \fIfield\fR[,...] [\fB-s\fR \fIsource\fR[,...]] \fBall\fR | \fIproperty\fR[,...] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR ...\fR
.ad
.sp .6
.RS 4n
Displays properties for the given datasets. If no datasets are specified, then the command displays properties for all datasets on the system. For each property, the following columns are displayed:
.sp
.in +2
.nf
    name      Dataset name
     property  Property name
     value     Property value
     source    Property source. Can either be local, default,
               temporary, inherited, or none (-).
.fi
.in -2
.sp

All columns except the \fBRECEIVED\fR column are displayed by default; specify particular or all columns, using the \fB-o\fR option. This command takes a comma-separated list of properties as described in the "Native Properties" and "User Properties" sections.
.sp
The special value \fBall\fR can be used to display all properties that apply to the given dataset's type (filesystem, volume, or snapshot).
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively display properties for any children.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-d\fR \fIdepth\fR\fR
.ad
.sp .6
.RS 4n
Recursively display any children of the dataset, limiting the recursion to \fIdepth\fR. A depth of \fB1\fR will display only the dataset and its direct children.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-H\fR\fR
.ad
.sp .6
.RS 4n
Display output in a form more easily parsed by scripts. Any headers are omitted, and fields are explicitly separated by a single tab instead of an arbitrary amount of space.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-o\fR \fIfield\fR\fR
.ad
.sp .6
.RS 4n
Set of fields to display. One or more of:
.sp
.in +2
.nf
name,property,value,received,source
.fi
.in -2
.sp

Present multiple fields as a comma-separated list. The default value is:
.sp
.in +2
.nf
name,property,value,source
.fi
.in -2
.sp

The keyword \fBall\fR specifies all sources.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-s\fR \fIsource\fR\fR
.ad
.sp .6
.RS 4n
A comma-separated list of sources to display. Those properties coming from a source other than those in this list are ignored. Each source must be one of the following:
.sp
.in +2
.nf
local,default,inherited,temporary,received,none
.fi
.in -2
.sp

The default value is all sources.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Display numbers in parseable (exact) values.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs inherit\fR [\fB-rS\fR] \fIproperty\fR \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR ...\fR
.ad
.sp .6
.RS 4n
Clears the specified property, causing it to be inherited from an ancestor. If no ancestor has the property set, then the default value is used. See the "Properties" section for a listing of default values, and details on which properties can be inherited.
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively inherit the given property for all children.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-S\fR\fR
.ad
.sp .6
.RS 4n
Revert to the received property value, if any. If the property does not have a received value, the behavior of \fBzfs inherit\fR \fB-S\fR is the same as \fBzfs inherit\fR without \fB-S\fR. If the property does have a received value, \fBzfs inherit\fR masks the received value with the inherited value until \fBzfs inherit\fR \fB-S\fR reverts to the received value.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs upgrade\fR [\fB-v\fR]\fR
.ad
.sp .6
.RS 4n
Displays a list of file systems that are not the most recent version.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs upgrade\fR [\fB-r\fR] [\fB-V\fR \fIversion\fR] [\fB-a\fR | \fIfilesystem\fR]\fR
.ad
.sp .6
.RS 4n
Upgrades file systems to a new on-disk version. Once this is done, the file systems will no longer be accessible on systems running older versions of the software. \fBzfs send\fR streams generated from new snapshots of these file systems cannot be accessed on systems running older versions of the software.
.sp
In general, the file system version is independent of the pool version. See \fBzpool\fR(1M) for information on the \fBzpool upgrade\fR command. 
.sp
In some cases, the file system version and the pool version are interrelated and the pool version must be upgraded before the file system version can be upgraded.
.sp
.ne 2
.mk
.na
\fB\fB-a\fR\fR
.ad
.sp .6
.RS 4n
Upgrade all file systems on all imported pools.
.RE

.sp
.ne 2
.mk
.na
\fB\fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
Upgrade the specified file system. 
.RE

.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Upgrade the specified file system and all descendent file systems 
.RE

.sp
.ne 2
.mk
.na
\fB\fB-V\fR \fIversion\fR\fR
.ad
.sp .6
.RS 4n
Upgrade to the specified \fIversion\fR. If the \fB-V\fR flag is not specified, this command upgrades to the most recent version. This option can only be used to increase the version number, and only up to the most recent version supported by this software.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs userspace\fR [\fB-niHp\fR] [\fB-o\fR \fIfield\fR[,...]] [\fB-sS\fR \fIfield\fR]... [\fB-t\fR \fItype\fR [,...]] \fIfilesystem\fR | \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
Displays space consumed by, and quotas on, each user in the specified filesystem or snapshot. This corresponds to the \fBuserused@\fR\fIuser\fR and \fBuserquota@\fR\fIuser\fR properties.
.sp
.ne 2
.mk
.na
\fB\fB-n\fR\fR
.ad
.sp .6
.RS 4n
Print numeric ID instead of user/group name.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-H\fR\fR
.ad
.sp .6
.RS 4n
Do not print headers, use tab-delimited output.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Use exact (parseable) numeric output.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-o\fR \fIfield\fR[,...]\fR
.ad
.sp .6
.RS 4n
Display only the specified fields from the following set, \fBtype,name,used,quota\fR.The default is to display all fields.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-s\fR \fIfield\fR\fR
.ad
.sp .6
.RS 4n
Sort output by this field. The \fIs\fR and \fIS\fR flags may be specified multiple times to sort first by one field, then by another. The default is \fB-s type\fR \fB-s name\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-S\fR \fIfield\fR\fR
.ad
.sp .6
.RS 4n
Sort by this field in reverse order. See \fB-s\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-t\fR \fItype\fR[,...]\fR
.ad
.sp .6
.RS 4n
Print only the specified types from the following set, \fBall,posixuser,smbuser,posixgroup,smbgroup\fR.
.sp
The default is \fB-t posixuser,smbuser\fR
.sp
The default can be changed to include group types.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-i\fR\fR
.ad
.sp .6
.RS 4n
Translate SID to POSIX ID. The POSIX ID may be ephemeral if no mapping exists. Normal POSIX interfaces (for example, \fBstat\fR(2), \fBls\fR \fB-l\fR) perform this translation, so the \fB-i\fR option allows the output from \fBzfs userspace\fR to be compared directly with those utilities. However, \fB-i\fR may lead to confusion if some files were created by an SMB user before a SMB-to-POSIX name mapping was established. In such a case, some files are owned by the SMB entity and some by the POSIX entity. However, the \fB-i\fR option will report that the POSIX entity has the total usage and quota for both.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs groupspace\fR [\fB-niHp\fR] [\fB-o\fR \fIfield\fR[,...]] [\fB-sS\fR \fIfield\fR]... [\fB-t\fR \fItype\fR [,...]] \fIfilesystem\fR | \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
Displays space consumed by, and quotas on, each group in the specified filesystem or snapshot. This subcommand is identical to \fBzfs userspace\fR, except that the default types to display are \fB-t posixgroup,smbgroup\fR.
.sp
.in +2
.nf
-
.fi
.in -2
.sp

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs mount\fR\fR
.ad
.sp .6
.RS 4n
Displays all \fBZFS\fR file systems currently mounted.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs mount\fR [\fB-vO\fR] [\fB-o\fR \fIoptions\fR] \fB-a\fR | \fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
Mounts \fBZFS\fR file systems. Invoked automatically as part of the boot process.
.sp
.ne 2
.mk
.na
\fB\fB-o\fR \fIoptions\fR\fR
.ad
.sp .6
.RS 4n
An optional, comma-separated list of mount options to use temporarily for the duration of the mount. See the "Temporary Mount Point Properties" section for details.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-O\fR\fR
.ad
.sp .6
.RS 4n
Perform an overlay mount. See \fBmount\fR(1M) for more information.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-v\fR\fR
.ad
.sp .6
.RS 4n
Report mount progress.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-a\fR\fR
.ad
.sp .6
.RS 4n
Mount all available \fBZFS\fR file systems. Invoked automatically as part of the boot process. 
.RE

.sp
.ne 2
.mk
.na
\fB\fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
Mount the specified filesystem.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs unmount\fR [\fB-f\fR] \fB-a\fR | \fIfilesystem\fR|\fImountpoint\fR\fR
.ad
.sp .6
.RS 4n
Unmounts currently mounted \fBZFS\fR file systems. Invoked automatically as part of the shutdown process.
.sp
.ne 2
.mk
.na
\fB\fB-f\fR\fR
.ad
.sp .6
.RS 4n
Forcefully unmount the file system, even if it is currently in use.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-a\fR\fR
.ad
.sp .6
.RS 4n
Unmount all available \fBZFS\fR file systems. Invoked automatically as part of the boot process. 
.RE

.sp
.ne 2
.mk
.na
\fB\fIfilesystem\fR|\fImountpoint\fR\fR
.ad
.sp .6
.RS 4n
Unmount the specified filesystem. The command can also be given a path to a \fBZFS\fR file system mount point on the system.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs share\fR \fB-a\fR | \fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
Shares available \fBZFS\fR file systems. 
.sp
.ne 2
.mk
.na
\fB\fB-a\fR\fR
.ad
.sp .6
.RS 4n
Share all available \fBZFS\fR file systems. Invoked automatically as part of the boot process. 
.RE

.sp
.ne 2
.mk
.na
\fB\fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
Share the specified filesystem according to the \fBsharenfs\fR and \fBsharesmb\fR properties. File systems are shared when the \fBsharenfs\fR or \fBsharesmb\fR property is set.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs unshare\fR \fB-a\fR | \fIfilesystem\fR|\fImountpoint\fR\fR
.ad
.sp .6
.RS 4n
Unshares currently shared \fBZFS\fR file systems. This is invoked automatically as part of the shutdown process.
.sp
.ne 2
.mk
.na
\fB\fB-a\fR\fR
.ad
.sp .6
.RS 4n
Unshare all available \fBZFS\fR file systems. Invoked automatically as part of the boot process. 
.RE

.sp
.ne 2
.mk
.na
\fB\fIfilesystem\fR|\fImountpoint\fR\fR
.ad
.sp .6
.RS 4n
Unshare the specified filesystem. The command can also be given a path to a \fBZFS\fR file system shared on the system.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs send\fR [\fB-DvRp\fR] [\fB-\fR[\fBiI\fR] \fIsnapshot\fR] \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
Creates a stream representation of the second \fIsnapshot\fR, which is written to standard output. The output can be redirected to a file or to a different system (for example, using \fBssh\fR(1). By default, a full stream is generated.
.sp
.ne 2
.mk
.na
\fB\fB-D\fR\fR
.ad
.sp .6
.RS 4n
Perform \fBdedup\fR processing on the stream. Deduplicated streams cannot be received on systems that do not support the stream deduplication feature.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-i\fR \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
Generate an incremental stream from the first \fIsnapshot\fR to the second \fIsnapshot\fR. The incremental source (the first \fIsnapshot\fR) can be specified as the last component of the snapshot name (for example, the part after the \fB@\fR), and it is assumed to be from the same file system as the second \fIsnapshot\fR.
.sp
If the destination is a clone, the source may be the origin snapshot, which must be fully specified (for example, \fBpool/fs@origin\fR, not just \fB@origin\fR).
.RE

.sp
.ne 2
.mk
.na
\fB\fB-I\fR \fIsnapshot\fR\fR
.ad
.sp .6
.RS 4n
Generate a stream package that sends all intermediary snapshots from the first snapshot to the second snapshot. For example, \fB-I @a fs@d\fR is similar to \fB-i @a fs@b; -i @b fs@c; -i @c fs@d\fR. The incremental source snapshot may be specified as with the \fB-i\fR option.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-R\fR\fR
.ad
.sp .6
.RS 4n
Generate a replication stream package, which will replicate the specified filesystem, and all descendent file systems, up to the named snapshot. When received, all properties, snapshots, descendent file systems, and clones are preserved.
.sp
If the \fB-i\fR or \fB-I\fR flags are used in conjunction with the \fB-R\fR flag, an incremental replication stream is generated. The current values of properties, and current snapshot and file system names are set when the stream is received. If the \fB-F\fR flag is specified when this stream is received, snapshots and file systems that do not exist on the sending side are destroyed. 
.RE

.sp
.ne 2
.mk
.na
\fB\fB-p\fR\fR
.ad
.sp .6
.RS 4n
Send properties.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-v\fR\fR
.ad
.sp .6
.RS 4n
Print verbose information about the stream package generated.
.RE

The format of the stream is committed. You will be able to receive your streams on future versions of \fBZFS\fR.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs receive\fR [\fB-vnFu\fR] \fIfilesystem\fR|\fIvolume\fR|\fIsnapshot\fR\fR
.ad
.br
.na
\fB\fBzfs receive\fR [\fB-vnFu\fR] [\fB-d\fR | \fB-e\fR] \fIfilesystem\fR\fR
.ad
.sp .6
.RS 4n
Creates a snapshot whose contents are as specified in the stream provided on standard input. If a full stream is received, then a new file system is created as well. Streams are created using the \fBzfs send\fR subcommand, which by default creates a full stream. \fBzfs recv\fR can be used as an alias for \fBzfs receive\fR.
.sp
If an incremental stream is received, then the destination file system must already exist, and its most recent snapshot must match the incremental stream's source. For \fBzvols\fR, the destination device link is destroyed and recreated, which means the \fBzvol\fR cannot be accessed during the \fBreceive\fR operation.
.sp
When a snapshot replication package stream that is generated by using the \fBzfs send\fR \fB-R\fR command is  received, any snapshots that do not exist on the sending location are destroyed by using the \fBzfs destroy\fR \fB-d\fR command.
.sp
The name of the snapshot (and file system, if a full stream is received) that this subcommand creates depends on the argument type and the \fB-d\fR or \fB-e\fR option.
.sp
If the argument is a snapshot name, the specified \fIsnapshot\fR is created. If the argument is a file system or volume name, a snapshot with the same name as the sent snapshot is created within the specified \fIfilesystem\fR or \fIvolume\fR. If the \fB-d\fR or \fB-e\fR option is specified, the snapshot name is determined by appending the sent snapshot's name to the specified filesystem. If the \fB-d\fR option is specified, all but the pool name of the sent snapshot path is appended (for example, \fBb/c@1\fR appended from sent snapshot \fBa/b/c@1\fR), and if the \fB-e\fR option is specified, only the tail of the sent snapshot path is appended (for example, \fBc@1\fR appended from sent snapshot \fBa/b/c@1\fR). In the case of \fB-d\fR, any file systems needed to replicate the path of the sent snapshot are created within the specified file system.
.sp
.ne 2
.mk
.na
\fB\fB-d\fR\fR
.ad
.sp .6
.RS 4n
Use all but the first element of the sent snapshot path (all but the pool name) to determine the name of the new snapshot as described in the paragraph above.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-e\fR\fR
.ad
.sp .6
.RS 4n
Use the last element of the sent snapshot path to determine the name of the new snapshot as described in the paragraph above.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-u\fR\fR
.ad
.sp .6
.RS 4n
File system that is associated with the received stream is not mounted.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-v\fR\fR
.ad
.sp .6
.RS 4n
Print verbose information about the stream and the time required to perform the receive operation.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-n\fR\fR
.ad
.sp .6
.RS 4n
Do not actually receive the stream. This can be useful in conjunction with the \fB-v\fR option to verify the name the receive operation would use.
.RE

.sp
.ne 2
.mk
.na
\fB\fB-F\fR\fR
.ad
.sp .6
.RS 4n
Force a rollback of the file system to the most recent snapshot before performing the receive operation. If receiving an incremental replication stream (for example, one generated by \fBzfs send -R -[iI]\fR), destroy snapshots and file systems that do not exist on the sending side.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs allow\fR \fIfilesystem\fR | \fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Displays permissions that have been delegated on the specified filesystem or volume. See the other forms of \fBzfs allow\fR for more information.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs allow\fR [\fB-ldug\fR] "\fIeveryone\fR"|\fIuser\fR|\fIgroup\fR[,...] \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR| \fIvolume\fR\fR
.ad
.br
.na
\fB\fBzfs allow\fR [\fB-ld\fR] \fB-e\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR | \fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Delegates \fBZFS\fR administration permission for the file systems to non-privileged users.
.sp
.ne 2
.mk
.na
\fB[\fB-ug\fR] "\fIeveryone\fR"|\fIuser\fR|\fIgroup\fR[,...]\fR
.ad
.sp .6
.RS 4n
Specifies to whom the permissions are delegated. Multiple entities can be specified as a comma-separated list. If neither of the \fB-ug\fR options are specified, then the argument is interpreted preferentially as the keyword "everyone", then as a user name, and lastly as a group name. To specify a user or group named "everyone", use the \fB-u\fR or \fB-g\fR options. To specify a group with the same name as a user, use the \fB-g\fR options.
.RE

.sp
.ne 2
.mk
.na
\fB[\fB-e\fR] \fIperm\fR|@\fIsetname\fR[,...]\fR
.ad
.sp .6
.RS 4n
Specifies that the permissions be delegated to "everyone." Multiple permissions may be specified as a comma-separated list. Permission names are the same as \fBZFS\fR subcommand and property names. See the property list below. Property set names, which begin with an at sign (\fB@\fR) , may be specified. See the \fB-s\fR form below for details.
.RE

.sp
.ne 2
.mk
.na
\fB[\fB-ld\fR] \fIfilesystem\fR|\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Specifies where the permissions are delegated. If neither of the \fB-ld\fR options are specified, or both are, then the permissions are allowed for the file system or volume, and all of its descendents. If only the \fB-l\fR option is used, then is allowed "locally" only for the specified file system. If only the \fB-d\fR option is used, then is allowed only for the descendent file systems.
.RE

.RE

.sp
.LP
Permissions are generally the ability to use a \fBZFS\fR subcommand or change a \fBZFS\fR property. The following permissions are available:
.sp
.in +2
.nf
NAME             TYPE           NOTES
allow            subcommand     Must also have the permission that is
                                being allowed
clone            subcommand     Must also have the 'create' ability and
                                'mount'
                                ability in the origin file system
create           subcommand     Must also have the 'mount' ability
destroy          subcommand     Must also have the 'mount' ability
hold             subcommand     Allows adding a user hold to a snapshot
mount            subcommand     Allows mount/umount of ZFS datasets
promote          subcommand     Must also have the 'mount' and 'promote'
                                ability in the origin file system
receive          subcommand     Must also have the 'mount' and 'create'
                                ability
release          subcommand     Allows releasing a user hold which
                                might destroy the snapshot
rename           subcommand     Must also have the 'mount' and 'create'
                                ability in the new parent
rollback         subcommand
send             subcommand     
share            subcommand     Allows sharing file systems over NFS or
                                SMB protocols
snapshot         subcommand
groupquota       other          Allows accessing any groupquota@...
                                property
groupused        other          Allows reading any groupused@... property
userprop         other          Allows changing any user property
userquota        other          Allows accessing any userquota@...
                                property
userused         other          Allows reading any userused@... property
aclinherit       property       
aclmode          property       
atime            property       
canmount         property       
casesensitivity  property       
checksum         property       
compression      property       
copies           property       
dedup            property
devices          property       
exec             property       
logbias          property
mlslabel         property
mountpoint       property       
nbmand           property       
normalization    property       
primarycache     property       
quota            property       
readonly         property       
recordsize       property       
refquota         property       
refreservation   property       
reservation      property       
secondarycache   property       
setuid           property       
shareiscsi       property       
sharenfs         property       
sharesmb         property       
snapdir          property       
utf8only         property       
version          property       
volblocksize     property       
volsize          property       
vscan            property       
xattr            property       
zoned            property       
.fi
.in -2
.sp

.sp
.ne 2
.mk
.na
\fB\fBzfs allow\fR \fB-c\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR|\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Sets "create time" permissions. These permissions are granted (locally) to the creator of any newly-created descendent file system.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs allow\fR \fB-s\fR @\fIsetname\fR \fIperm\fR|@\fIsetname\fR[,...] \fIfilesystem\fR|\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Defines or adds permissions to a permission set. The set can be used by other \fBzfs allow\fR commands for the specified file system and its descendents. Sets are evaluated dynamically, so changes to a set are immediately reflected. Permission sets follow the same naming restrictions as ZFS file systems, but the name must begin with an "at sign" (\fB@\fR), and can be no more than 64 characters long.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs unallow\fR [\fB-rldug\fR] "\fIeveryone\fR"|\fIuser\fR|\fIgroup\fR[,...] [\fIperm\fR|@\fIsetname\fR[, ...]] \fIfilesystem\fR|\fIvolume\fR\fR
.ad
.br
.na
\fB\fBzfs unallow\fR [\fB-rld\fR] \fB-e\fR [\fIperm\fR|@\fIsetname\fR [,...]] \fIfilesystem\fR|\fIvolume\fR\fR
.ad
.br
.na
\fB\fBzfs unallow\fR [\fB-r\fR] \fB-c\fR [\fIperm\fR|@\fIsetname\fR[,...]]\fR
.ad
.br
.na
\fB\fIfilesystem\fR|\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Removes permissions that were granted with the \fBzfs allow\fR command. No permissions are explicitly denied, so other permissions granted are still in effect. For example, if the permission is granted by an ancestor. If no permissions are specified, then all permissions for the specified \fIuser\fR, \fIgroup\fR, or \fIeveryone\fR are removed. Specifying "everyone" (or using the \fB-e\fR option) only removes the permissions that were granted to "everyone", not all permissions for every user and group. See the \fBzfs allow\fR command for a description of the \fB-ldugec\fR options.
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively remove the permissions from this file system and all descendents.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs unallow\fR [\fB-r\fR] \fB-s\fR @\fIsetname\fR [\fIperm\fR|@\fIsetname\fR[,...]]\fR
.ad
.br
.na
\fB\fIfilesystem\fR|\fIvolume\fR\fR
.ad
.sp .6
.RS 4n
Removes permissions from a permission set. If no permissions are specified, then all permissions are removed, thus removing the set entirely.
.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs hold\fR [\fB-r\fR] \fItag\fR \fIsnapshot\fR...\fR
.ad
.sp .6
.RS 4n
Adds a single reference, named with the \fItag\fR argument, to the specified snapshot or snapshots. Each snapshot has its own tag namespace, and tags must be unique within that space.
.sp
If a hold exists on a snapshot, attempts to destroy that snapshot by using the \fBzfs destroy\fR command return \fBEBUSY\fR.
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Specifies that a hold with the given tag is applied recursively to the snapshots of all descendent file systems.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs holds\fR [\fB-r\fR] \fIsnapshot\fR...\fR
.ad
.sp .6
.RS 4n
Lists all existing user references for the given snapshot or snapshots.
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Lists the holds that are set on the named descendent snapshots, in addition to listing the holds on the named snapshot.
.RE

.RE

.sp
.ne 2
.mk
.na
\fB\fBzfs release\fR [\fB-r\fR] \fItag\fR \fIsnapshot\fR...\fR
.ad
.sp .6
.RS 4n
Removes a single reference, named with the \fItag\fR argument, from the specified snapshot or snapshots. The tag must already exist for each snapshot.
.sp
If a hold exists on a snapshot, attempts to destroy that snapshot by using the \fBzfs destroy\fR command return \fBEBUSY\fR.
.sp
.ne 2
.mk
.na
\fB\fB-r\fR\fR
.ad
.sp .6
.RS 4n
Recursively releases a hold with the given tag on the snapshots of all descendent file systems.
.RE

.RE

.SH EXAMPLES
.LP
\fBExample 1 \fRCreating a ZFS File System Hierarchy
.sp
.LP
The following commands create a file system named \fBpool/home\fR and a file system named \fBpool/home/bob\fR. The mount point \fB/export/home\fR is set for the parent file system, and is automatically inherited by the child file system.

.sp
.in +2
.nf
# \fBzfs create pool/home\fR
# \fBzfs set mountpoint=/export/home pool/home\fR
# \fBzfs create pool/home/bob\fR
.fi
.in -2
.sp

.LP
\fBExample 2 \fRCreating a ZFS Snapshot
.sp
.LP
The following command creates a snapshot named \fByesterday\fR. This snapshot is mounted on demand in the \fB\&.zfs/snapshot\fR directory at the root of the \fBpool/home/bob\fR file system.

.sp
.in +2
.nf
# \fBzfs snapshot pool/home/bob@yesterday\fR
.fi
.in -2
.sp

.LP
\fBExample 3 \fRCreating and Destroying Multiple Snapshots
.sp
.LP
The following command creates snapshots named \fByesterday\fR of \fBpool/home\fR and all of its descendent file systems. Each snapshot is mounted on demand in the \fB\&.zfs/snapshot\fR directory at the root of its file system. The second command destroys the newly created snapshots.

.sp
.in +2
.nf
# \fBzfs snapshot -r pool/home@yesterday\fR
# \fBzfs destroy -r pool/home@yesterday\fR
.fi
.in -2
.sp

.LP
\fBExample 4 \fRDisabling and Enabling File System Compression
.sp
.LP
The following command disables the \fBcompression\fR property for all file systems under \fBpool/home\fR. The next command explicitly enables \fBcompression\fR for \fBpool/home/anne\fR.

.sp
.in +2
.nf
# \fBzfs set compression=off pool/home\fR
# \fBzfs set compression=on pool/home/anne\fR
.fi
.in -2
.sp

.LP
\fBExample 5 \fRListing ZFS Datasets
.sp
.LP
The following command lists all active file systems and volumes in the system. Snapshots are displayed if the \fBlistsnaps\fR property is \fBon\fR. The default is \fBoff\fR. See \fBzpool\fR(1M) for more information on pool properties.

.sp
.in +2
.nf
# \fBzfs list\fR
   NAME                      USED  AVAIL  REFER  MOUNTPOINT
   pool                      450K   457G    18K  /pool
   pool/home                 315K   457G    21K  /export/home
   pool/home/anne             18K   457G    18K  /export/home/anne
   pool/home/bob             276K   457G   276K  /export/home/bob
.fi
.in -2
.sp

.LP
\fBExample 6 \fRSetting a Quota on a ZFS File System
.sp
.LP
The following command sets a quota of 50 Gbytes for \fBpool/home/bob\fR.

.sp
.in +2
.nf
# \fBzfs set quota=50G pool/home/bob\fR
.fi
.in -2
.sp

.LP
\fBExample 7 \fRListing ZFS Properties
.sp
.LP
The following command lists all properties for \fBpool/home/bob\fR.

.sp
.in +2
.nf
# \fBzfs get all pool/home/bob\fR
NAME           PROPERTY              VALUE                  SOURCE
pool/home/bob  type                  filesystem             -
pool/home/bob  creation              Mon Nov  9 15:05 2009  -
pool/home/bob  used                  282M                   -
pool/home/bob  available             134G                   -
pool/home/bob  referenced            282M                   -
pool/home/bob  compressratio         1.00x                  -
pool/home/bob  mounted               yes                    -
pool/home/bob  quota                 none                   default
pool/home/bob  reservation           none                   default
pool/home/bob  recordsize            128K                   default
pool/home/bob  mountpoint            /pool/home/bob         default
pool/home/bob  sharenfs              off                    default
pool/home/bob  checksum              on                     default
pool/home/bob  compression           on                     local
pool/home/bob  atime                 on                     default
pool/home/bob  devices               on                     default
pool/home/bob  exec                  on                     default
pool/home/bob  setuid                on                     default
pool/home/bob  readonly              off                    default
pool/home/bob  zoned                 off                    default
pool/home/bob  snapdir               hidden                 default
pool/home/bob  aclmode               groupmask              default
pool/home/bob  aclinherit            restricted             default
pool/home/bob  canmount              on                     default
pool/home/bob  shareiscsi            off                    default
pool/home/bob  xattr                 on                     default
pool/home/bob  copies                1                      default
pool/home/bob  version               4                      -
pool/home/bob  utf8only              off                    -
pool/home/bob  normalization         none                   -
pool/home/bob  casesensitivity       sensitive              -
pool/home/bob  vscan                 off                    default
pool/home/bob  nbmand                off                    default
pool/home/bob  sharesmb              off                    default
pool/home/bob  refquota              none                   default
pool/home/bob  refreservation        none                   default
pool/home/bob  primarycache          all                    default
pool/home/bob  secondarycache        all                    default
pool/home/bob  usedbysnapshots       0                      -
pool/home/bob  usedbydataset         282M                   -
pool/home/bob  usedbychildren        0                      -
pool/home/bob  usedbyrefreservation  0                      -
pool/home/bob  logbias               latency                default
pool/home/bob  dedup                 off                    default
pool/home/bob  mlslabel              none                   default
.fi
.in -2
.sp

.sp
.LP
The following command gets a single property value.

.sp
.in +2
.nf
# \fBzfs get -H -o value compression pool/home/bob\fR
on
.fi
.in -2
.sp

.sp
.LP
The following command lists all properties with local settings for \fBpool/home/bob\fR.

.sp
.in +2
.nf
# \fBzfs get -r -s local -o name,property,value all pool/home/bob\fR
NAME           PROPERTY              VALUE
pool/home/bob  quota                 20G
pool/home/bob  compression           on
.fi
.in -2
.sp

.LP
\fBExample 8 \fRRolling Back a ZFS File System
.sp
.LP
The following command reverts the contents of \fBpool/home/anne\fR to the snapshot named \fByesterday\fR, deleting all intermediate snapshots.

.sp
.in +2
.nf
# \fBzfs rollback -r pool/home/anne@yesterday\fR
.fi
.in -2
.sp

.LP
\fBExample 9 \fRCreating a ZFS Clone
.sp
.LP
The following command creates a writable file system whose initial contents are the same as \fBpool/home/bob@yesterday\fR.

.sp
.in +2
.nf
# \fBzfs clone pool/home/bob@yesterday pool/clone\fR
.fi
.in -2
.sp

.LP
\fBExample 10 \fRPromoting a ZFS Clone
.sp
.LP
The following commands illustrate how to test out changes to a file system, and then replace the original file system with the changed one, using clones, clone promotion, and renaming:

.sp
.in +2
.nf
# \fBzfs create pool/project/production\fR
  populate /pool/project/production with data
# \fBzfs snapshot pool/project/production@today\fR
# \fBzfs clone pool/project/production@today pool/project/beta\fR
make changes to /pool/project/beta and test them
# \fBzfs promote pool/project/beta\fR
# \fBzfs rename pool/project/production pool/project/legacy\fR
# \fBzfs rename pool/project/beta pool/project/production\fR
once the legacy version is no longer needed, it can be destroyed
# \fBzfs destroy pool/project/legacy\fR
.fi
.in -2
.sp

.LP
\fBExample 11 \fRInheriting ZFS Properties
.sp
.LP
The following command causes \fBpool/home/bob\fR and \fBpool/home/anne\fR to inherit the \fBchecksum\fR property from their parent.

.sp
.in +2
.nf
# \fBzfs inherit checksum pool/home/bob pool/home/anne\fR
.fi
.in -2
.sp

.LP
\fBExample 12 \fRRemotely Replicating ZFS Data
.sp
.LP
The following commands send a full stream and then an incremental stream to a remote machine, restoring them into \fBpoolB/received/fs@a\fRand \fBpoolB/received/fs@b\fR, respectively. \fBpoolB\fR must contain the file system \fBpoolB/received\fR, and must not initially contain \fBpoolB/received/fs\fR.

.sp
.in +2
.nf
# \fBzfs send pool/fs@a | \e\fR
   \fBssh host zfs receive poolB/received/fs@a\fR
# \fBzfs send -i a pool/fs@b | ssh host \e\fR
   \fBzfs receive poolB/received/fs\fR
.fi
.in -2
.sp

.LP
\fBExample 13 \fRUsing the \fBzfs receive\fR \fB-d\fR Option
.sp
.LP
The following command sends a full stream of \fBpoolA/fsA/fsB@snap\fR to a remote machine, receiving it into \fBpoolB/received/fsA/fsB@snap\fR. The \fBfsA/fsB@snap\fR portion of the received snapshot's name is determined from the name of the sent snapshot. \fBpoolB\fR must contain the file system \fBpoolB/received\fR. If \fBpoolB/received/fsA\fR does not exist, it is created as an empty file system.

.sp
.in +2
.nf
# \fBzfs send poolA/fsA/fsB@snap | \e
   ssh host zfs receive -d poolB/received\fR
.fi
.in -2
.sp

.LP
\fBExample 14 \fRSetting User Properties
.sp
.LP
The following example sets the user-defined \fBcom.example:department\fR property for a dataset.

.sp
.in +2
.nf
# \fBzfs set com.example:department=12345 tank/accounting\fR
.fi
.in -2
.sp

.LP
\fBExample 15 \fRCreating a ZFS Volume as an iSCSI Target Device
.sp
.LP
The following example shows how to create a \fBZFS\fR volume as an \fBiSCSI\fR target. 

.sp
.in +2
.nf
# \fBzfs create -V 2g pool/volumes/vol1\fR
# \fBzfs set shareiscsi=on pool/volumes/vol1\fR
# \fBiscsitadm list target\fR
Target: pool/volumes/vol1
 iSCSI Name: 
 iqn.1986-03.com.sun:02:7b4b02a6-3277-eb1b-e686-a24762c52a8c
 Connections: 0
.fi
.in -2
.sp

.sp
.LP
After the \fBiSCSI\fR target is created, set up the \fBiSCSI\fR initiator. For more information about the Solaris \fBiSCSI\fR initiator, see \fBiscsitadm\fR(1M).
.LP
\fBExample 16 \fRPerforming a Rolling Snapshot
.sp
.LP
The following example shows how to maintain a history of snapshots with a consistent naming scheme. To keep a week's worth of snapshots, the user destroys the oldest snapshot, renames the remaining snapshots, and then creates a new snapshot, as follows:

.sp
.in +2
.nf
# \fBzfs destroy -r pool/users@7daysago\fR
# \fBzfs rename -r pool/users@6daysago @7daysago\fR
# \fBzfs rename -r pool/users@5daysago @6daysago\fR
# \fBzfs rename -r pool/users@yesterday @5daysago\fR
# \fBzfs rename -r pool/users@yesterday @4daysago\fR
# \fBzfs rename -r pool/users@yesterday @3daysago\fR
# \fBzfs rename -r pool/users@yesterday @2daysago\fR
# \fBzfs rename -r pool/users@today @yesterday\fR
# \fBzfs snapshot -r pool/users@today\fR
.fi
.in -2
.sp

.LP
\fBExample 17 \fRSetting \fBsharenfs\fR Property Options on a ZFS File System
.sp
.LP
The following commands show how to set \fBsharenfs\fR property options to enable \fBrw\fR access for a set of \fBIP\fR addresses and to enable root access for system \fBneo\fR on the \fBtank/home\fR file system.

.sp
.in +2
.nf
# \fB# zfs set sharenfs='rw=@123.123.0.0/16,root=neo' tank/home\fR
.fi
.in -2
.sp

.sp
.LP
If you are using \fBDNS\fR for host name resolution, specify the fully qualified hostname.

.LP
\fBExample 18 \fRDelegating ZFS Administration Permissions on a ZFS Dataset
.sp
.LP
The following example shows how to set permissions so that user \fBcindys\fR can create, destroy, mount, and take snapshots on \fBtank/cindys\fR. The permissions on \fBtank/cindys\fR are also displayed.

.sp
.in +2
.nf
# \fBzfs allow cindys create,destroy,mount,snapshot tank/cindys\fR
# \fBzfs allow tank/cindys\fR
-------------------------------------------------------------
Local+Descendent permissions on (tank/cindys)
          user cindys create,destroy,mount,snapshot
-------------------------------------------------------------
.fi
.in -2
.sp

.sp
.LP
Because the \fBtank/cindys\fR mount point permission is set to 755 by default, user \fBcindys\fR will be unable to mount file systems under \fBtank/cindys\fR. Set an \fBACL\fR similar to the following syntax to provide mount point access:
.sp
.in +2
.nf
# \fBchmod A+user:cindys:add_subdirectory:allow /tank/cindys\fR
.fi
.in -2
.sp

.LP
\fBExample 19 \fRDelegating Create Time Permissions on a ZFS Dataset
.sp
.LP
The following example shows how to grant anyone in the group \fBstaff\fR to create file systems in \fBtank/users\fR. This syntax also allows staff members to destroy their own file systems, but not destroy anyone else's file system. The permissions on \fBtank/users\fR are also displayed.

.sp
.in +2
.nf
# \fB# zfs allow staff create,mount tank/users\fR
# \fBzfs allow -c destroy tank/users\fR
# \fBzfs allow tank/users\fR
-------------------------------------------------------------
Create time permissions on (tank/users)
          create,destroy
Local+Descendent permissions on (tank/users)
          group staff create,mount
------------------------------------------------------------- 
.fi
.in -2
.sp

.LP
\fBExample 20 \fRDefining and Granting a Permission Set on a ZFS Dataset
.sp
.LP
The following example shows how to define and grant a permission set on the \fBtank/users\fR file system. The permissions on \fBtank/users\fR are also displayed.

.sp
.in +2
.nf
# \fBzfs allow -s @pset create,destroy,snapshot,mount tank/users\fR
# \fBzfs allow staff @pset tank/users\fR
# \fBzfs allow tank/users\fR
-------------------------------------------------------------
Permission sets on (tank/users)
        @pset create,destroy,mount,snapshot
Create time permissions on (tank/users)
        create,destroy
Local+Descendent permissions on (tank/users)
        group staff @pset,create,mount
-------------------------------------------------------------
.fi
.in -2
.sp

.LP
\fBExample 21 \fRDelegating Property Permissions on a ZFS Dataset
.sp
.LP
The following example shows to grant the ability to set quotas and reservations on the \fBusers/home\fR file system. The permissions on \fBusers/home\fR are also displayed.

.sp
.in +2
.nf
# \fBzfs allow cindys quota,reservation users/home\fR
# \fBzfs allow users/home\fR
-------------------------------------------------------------
Local+Descendent permissions on (users/home)
        user cindys quota,reservation
-------------------------------------------------------------
cindys% \fBzfs set quota=10G users/home/marks\fR
cindys% \fBzfs get quota users/home/marks\fR
NAME              PROPERTY  VALUE             SOURCE
users/home/marks  quota     10G               local 
.fi
.in -2
.sp

.LP
\fBExample 22 \fRRemoving ZFS Delegated Permissions on a ZFS Dataset
.sp
.LP
The following example shows how to remove the snapshot permission from the \fBstaff\fR group on the \fBtank/users\fR file system. The permissions on \fBtank/users\fR are also displayed.

.sp
.in +2
.nf
# \fBzfs unallow staff snapshot tank/users\fR
# \fBzfs allow tank/users\fR
-------------------------------------------------------------
Permission sets on (tank/users)
        @pset create,destroy,mount,snapshot
Create time permissions on (tank/users)
        create,destroy
Local+Descendent permissions on (tank/users)
        group staff @pset,create,mount
------------------------------------------------------------- 
.fi
.in -2
.sp

.SH EXIT STATUS
.sp
.LP
The following exit values are returned:
.sp
.ne 2
.mk
.na
\fB\fB0\fR\fR
.ad
.sp .6
.RS 4n
Successful completion. 
.RE

.sp
.ne 2
.mk
.na
\fB\fB1\fR\fR
.ad
.sp .6
.RS 4n
An error occurred.
.RE

.sp
.ne 2
.mk
.na
\fB\fB2\fR\fR
.ad
.sp .6
.RS 4n
Invalid command line options were specified.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
AvailabilitySUNWzfsu
_
Interface StabilityCommitted
.TE

.SH SEE ALSO
.sp
.LP
\fBssh\fR(1), \fBiscsitadm\fR(1M), \fBmount\fR(1M), \fBshare\fR(1M), \fBsharemgr\fR(1M), \fBunshare\fR(1M), \fBzonecfg\fR(1M), \fBzpool\fR(1M), \fBchmod\fR(2), \fBstat\fR(2), \fBwrite\fR(2), \fBfsync\fR(3C), \fBdfstab\fR(4), \fBattributes\fR(5)
.sp
.LP
See the \fBgzip\fR(1) man page, which is not part of the SunOS man page collection.
.sp
.LP
For information about using the \fBZFS\fR web-based management tool and other \fBZFS\fR features, see the \fISolaris ZFS Administration Guide\fR.