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  • 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

      
     
    • 1.1 Disclaimer 
    • 1.2 What is RAID? 
    • 1.3 Terms 
    • 1.4 The RAID levels 
    • 1.5 Requirements 
     

     

    2. Why RAID?

      
     
    • 2.1 Device and filesystem support 
    • 2.2 Performance 
    • 2.3 Swapping on RAID 
    • 2.4 Why mdadm? 
     

     

    3. Devices

      
     
    • 3.1 Spare disks 
    • 3.2 Faulty disks 
     

     

    4. Hardware issues

      
     
    • 4.1 IDE Configuration 
    • 4.2 Hot Swap 
     

     

    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-level and raidtab 
    • 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

      
     
    • 8.1 Recovery from a multiple disk failure 
     

     

    9. Performance

      
     
    • 9.1 RAID-0 
    • 9.2 RAID-0 with TCQ 
    • 9.3 RAID-5 
    • 9.4 RAID-10 
    • 9.5 Fresh benchmarking tools 
     

     

    10. Related tools

      
     
    • 10.1 RAID resizing and conversion 
    • 10.2 Backup 
     

     

    11. Partitioning RAID / LVM on RAID

      
     
    • 11.1 Partitioning RAID devices 
    • 11.2 LVM on RAID 
     

     

    12. Credits

      

     

    13. Changelog

      
     
    • 13.1 Version 1.1
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