Creating RAID 5 (Striping with Distributed Parity) in Linux – Part 4

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5 Responses

  1. mohsin says:

    did this on an Arch Linux setup and it worked flawlessly

  2. ludvig says:

    that cat etc/mdadm.conf it always says no such file or directory

    • @ludvig,

      You need to create the mdadm.conf manually using below command. This should be done before rebooting once you create your RAID setup.

      # mdadm -E -s -v >> /etc/mdadm.conf

  3. If you are using this setup with drives that are > 2TB you cannot use fdisk, you must use parted to create the partitions. Everything else can be the same, however.

  4. Richard Teusch says:

    Read errors is the serious issue with RAID.
    If the disk fails, the RAID will have to read all the disks that remain in the RAID group to rebuild.
    A read error during the rebuild will cause data loss since we need to read all other disks during rebuild.

    http://www.zdnet.com/article/why-raid-5-stops-working-in-2009/

    SATA disks experience read failure once every 12,5 TB of read operations, that means if the data on the surviving disks totals 12.5TB, the rebuild is certain to fail.

    http://www.lucidti.com/zfs-checksums-add-reliability-to-nas-storage

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