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Thread: Software (mdadm) Raid 6 array rebuild failure

  1. #11
    Join Date
    Oct 2011
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    80

    Re: Software (mdadm) Raid 6 array rebuild failure

    I like software RAID. I use it on my home servers. No matter what RAID you use, I always maintain well tested backups.

  2. #12
    Join Date
    Jul 2010
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    Michigan, USA
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    2,133
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    Ubuntu 16.04 Xenial Xerus

    Re: Software (mdadm) Raid 6 array rebuild failure

    You shouldn't have to do this, but to get it to work, you might need to zero the superblocks on each disk, then try the recreate again.
    Last edited by rubylaser; January 1st, 2012 at 11:37 PM.

  3. #13
    Join Date
    Dec 2010
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    7

    Re: Software (mdadm) Raid 6 array rebuild failure

    You shouldn't have to do this, but to get it to work, you might need to zero the superblocks on each disk, then try the recreate again.
    Are there any good tutorials online on how to do this? Or could you give me a quick explanation of what I want to do?

  4. #14
    Join Date
    Jul 2010
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    2,133
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    Ubuntu 16.04 Xenial Xerus

    Re: Software (mdadm) Raid 6 array rebuild failure

    If you have to zero the superblocks to recreate the array, it's very likely your data is not going to be in a functioning state after recreating the array. Here are the directions to zero the superblocks.

    Code:
    mdadm --zero-superblock /dev/sdb1
    mdadm --zero-superblock /dev/sdc1
    mdadm --zero-superblock /dev/sdd1
    etc...
    Code:
    mdadm --create --verbose /dev/md0 --level=6 --raid-devices=7 /dev/sd[bcdefgh]1

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