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<H1>The Software-RAID HOWTO</H1>

<H2>Jakob &Oslash;stergaard
        (
<A HREF="mailto:jakob@ostenfeld.dk">jakob@ostenfeld.dk</A>)</H2>v. 0.90.7 19th of January 2000
<P><HR>
<EM>This HOWTO describes how to use Software RAID under Linux. It
addresses a specific version of the Software RAID layer, namely the
0.90 RAID layer made by Ingo Molnar and others. This is the RAID layer
that will be standard in Linux-2.4, and it is the version that is also
used by Linux-2.2 kernels shipped from some vendors. The 0.90 RAID
support is available as patches to Linux-2.0 and Linux-2.2, and is by
many considered far more stable that the older RAID support already in
those kernels.</EM>
<HR>
<P>
<H2><A NAME="toc1">1.</A> <A HREF="Software-RAID.HOWTO-1.html">Introduction</A></H2>

<UL>
<LI><A HREF="Software-RAID.HOWTO-1.html#ss1.1">1.1 Disclaimer</A>
<LI><A HREF="Software-RAID.HOWTO-1.html#ss1.2">1.2 Requirements</A>
</UL>
<P>
<H2><A NAME="toc2">2.</A> <A HREF="Software-RAID.HOWTO-2.html">Why RAID ?</A></H2>

<UL>
<LI><A HREF="Software-RAID.HOWTO-2.html#ss2.1">2.1 Technicalities</A>
<LI><A HREF="Software-RAID.HOWTO-2.html#ss2.2">2.2 Terms</A>
<LI><A HREF="Software-RAID.HOWTO-2.html#ss2.3">2.3 The RAID levels</A>
<LI><A HREF="Software-RAID.HOWTO-2.html#ss2.4">2.4 Swapping on RAID</A>
</UL>
<P>
<H2><A NAME="toc3">3.</A> <A HREF="Software-RAID.HOWTO-3.html">Hardware issues</A></H2>

<UL>
<LI><A HREF="Software-RAID.HOWTO-3.html#ss3.1">3.1 IDE Configuration</A>
<LI><A HREF="Software-RAID.HOWTO-3.html#ss3.2">3.2 Hot Swap</A>
</UL>
<P>
<H2><A NAME="toc4">4.</A> <A HREF="Software-RAID.HOWTO-4.html">RAID setup</A></H2>

<UL>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.1">4.1 General setup</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.2">4.2 Linear mode</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.3">4.3 RAID-0</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.4">4.4 RAID-1</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.5">4.5 RAID-4</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.6">4.6 RAID-5</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.7">4.7 The Persistent Superblock</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.8">4.8 Chunk sizes</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.9">4.9 Options for mke2fs</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.10">4.10 Autodetection</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.11">4.11 Booting on RAID</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.12">4.12 Root filesystem on RAID</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.13">4.13 Making the system boot on RAID</A>
<LI><A HREF="Software-RAID.HOWTO-4.html#ss4.14">4.14 Pitfalls</A>
</UL>
<P>
<H2><A NAME="toc5">5.</A> <A HREF="Software-RAID.HOWTO-5.html">Testing</A></H2>

<UL>
<LI><A HREF="Software-RAID.HOWTO-5.html#ss5.1">5.1 Simulating a drive failure</A>
<LI><A HREF="Software-RAID.HOWTO-5.html#ss5.2">5.2 Simulating data corruption</A>
</UL>
<P>
<H2><A NAME="toc6">6.</A> <A HREF="Software-RAID.HOWTO-6.html">Reconstruction</A></H2>

<UL>
<LI><A HREF="Software-RAID.HOWTO-6.html#ss6.1">6.1 Recovery from a multiple disk failure</A>
</UL>
<P>
<H2><A NAME="toc7">7.</A> <A HREF="Software-RAID.HOWTO-7.html">Performance</A></H2>

<UL>
<LI><A HREF="Software-RAID.HOWTO-7.html#ss7.1">7.1 RAID-0</A>
<LI><A HREF="Software-RAID.HOWTO-7.html#ss7.2">7.2 RAID-0 with TCQ</A>
<LI><A HREF="Software-RAID.HOWTO-7.html#ss7.3">7.3 RAID-5</A>
<LI><A HREF="Software-RAID.HOWTO-7.html#ss7.4">7.4 RAID-10</A>
</UL>
<P>
<H2><A NAME="toc8">8.</A> <A HREF="Software-RAID.HOWTO-8.html">Credits</A></H2>

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