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<!doctype linuxdoc system> <article> <title>The Software-RAID HOWTO</title> <author>Jakob Østergaard</author> ( jakob@unthought.net) v0.90.8, 2002-08-05

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 is the 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.

1. Introduction 1.1 Disclaimer 1.2 Requirements

2. Why RAID ? 2.1 Device and filesystem support 2.2 Performance 2.3 Terms 2.4 The RAID levels 2.5 Swapping on RAID

3. Hardware issues 3.1 IDE Configuration 3.2 Hot Swap

4. RAID setup 4.1 General setup 4.2 Linear mode 4.3 RAID-0 4.4 RAID-1 4.5 RAID-4 4.6 RAID-5 4.7 The Persistent Superblock 4.8 Chunk sizes 4.9 Options for mke2fs 4.10 Autodetection 4.11 Booting on RAID 4.12 Root filesystem on RAID 4.13 Making the system boot on RAID 4.14 Converting a non-RAID RedHat System to run on Software RAID 4.15 Pitfalls

5. Testing 5.1 Simulating a drive failure 5.2 Simulating data corruption

6. Reconstruction 6.1 Recovery from a multiple disk failure

7. Performance 7.1 RAID-0 7.2 RAID-0 with TCQ 7.3 RAID-5 7.4 RAID-10

8. Related tools 8.1 A raidtools supplement or replacement: mdadm 8.2 RAID resizing and conversion 8.3 Backup

9. Credits </article>

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