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Thread: MD Raid problem

  1. #1

    Default MD Raid problem

    Hi all,

    I have a problem with my 3 drive (sdb1, sdc1, and sdd1) raid 5 on SUSE 11.3

    I had a failed drive (sdd1) , so replaced it, when I went to remove the drive using mdadm I removed the wrong drive (sdb1).

    Could someone please help with this?

    Thanks

  2. #2

    Default Re: MD Raid problem

    scott nickless wrote:
    > I have a problem with my 3 drive (sdb1, sdc1, and sdd1) raid 5 on SUSE
    > 11.3
    >
    > I had a failed drive (sdd1) , so replaced it, when I went to remove the
    > drive using mdadm I removed the wrong drive (sdb1).
    >
    > Could someone please help with this?


    It depends

    As long as you haven't done anything else ...

    If your RAID is not an essential part of your system (e.g. a data store)
    then you can fix it easily. If it is /home or / then it gets more
    complicated.

    You basically need to confirm that the RAID is in a consistent
    non-working state (and use commands to make it so if it isn't).

    Then you need to re-add sdb1, at which point it could be used, but that
    is risky. Better is to then immediately add the replacement and rebuild
    the RAID.

    I'm afraid I don't remember the exact command incantations to use. I
    think you start with 'cat /proc/mdstat' to find out how things stand and
    then use mdadm. mdadm is the most important; getting the arguments right
    is the tricky bit!

    The main source of info is at
    <https://raid.wiki.kernel.org/index.php/Linux_Raid>

    Try the troubleshooting and reconstruction sections in particular. It
    may also be worth reading the relevant bits of
    <http://www.novell.com/documentation/sles11/pdfdoc/stor_admin/stor_admin.pdf>

    HTH, Dave

  3. #3

    Default Re: MD Raid problem

    Hi Dave,

    I just thought I'd let you know that i got my RAID working again. The information in the first link pointed me in the right direction. Basically I had to try different permutations of the mdadm --create command.

    Thank you again for your help.
    Scott

  4. #4

    Default Re: MD Raid problem

    scott nickless wrote:
    > I just thought I'd let you know that i got my RAID working again. The
    > information in the first link pointed me in the right direction.
    > Basically I had to try different permutations of the mdadm --create
    > command.


    That's good to hear, Scott. It can be quite a scary time when something
    like that happens!

    Cheers, Dave

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