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.. SPDX-License-Identifier: GPL-2.0
======================================
Linux SCSI Disk Driver (sd) Parameters
======================================
cache_type (RW)
---------------
Enable/disable drive write & read cache.
=========================== === === =========== ==========
cache_type string WCE RCD Write cache Read cache
=========================== === === =========== ==========
write through 0 0 off on
none 0 1 off off
write back 1 0 on on
write back, no read (daft) 1 1 on off
=========================== === === =========== ==========
To set cache type to "write back" and save this setting to the drive::
# echo "write back" > cache_type
To modify the caching mode without making the change persistent, prepend
"temporary " to the cache type string. E.g.::
# echo "temporary write back" > cache_type
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