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The Software-RAID HOWTO
Jakob Østergaard
jakob@unthought.net
and Emilio Bueso
bueso@vives.org
v1.1, 2004-06-03
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
2. Why RAID?
3. Devices
4. Hardware issues
5. RAID setup
- 5.1 General setup
- 5.2 Downloading and installing the RAID tools
- 5.3 Downloading and installing mdadm
- 5.4 Linear mode
- 5.5 RAID-0
- 5.6 RAID-1
- 5.7 RAID-4
- 5.8 RAID-5
- 5.9 The Persistent Superblock
- 5.10 Chunk sizes
- 5.11 Options for mke2fs
6. Detecting, querying and testing
- 6.1 Detecting a drive failure
- 6.2 Querying the arrays status
- 6.3 Simulating a drive failure
- 6.4 Simulating data corruption
- 6.5 Monitoring RAID arrays
7. Tweaking, tuning and troubleshooting
- 7.1
raid-levelandraidtab - 7.2 Autodetection
- 7.3 Booting on RAID
- 7.4 Root filesystem on RAID
- 7.5 Making the system boot on RAID
- 7.6 Converting a non-RAID RedHat System to run on Software RAID
- 7.7 Sharing spare disks between different arrays
- 7.8 Pitfalls
8. Reconstruction
9. Performance
10. Related tools
11. Partitioning RAID / LVM on RAID
12. Credits
13. Changelog
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