[SASAG] Broken Raid 5 Repair

Justin Huff jjhuff at mspin.net
Wed Sep 9 09:32:43 PDT 2009


I've had pretty good luck recovering from some cable-related problems
causing multiple drive 'failures' in fairly quick succession.  A
couple key factors made this work:

1. I had a sufficient number of drives that were *nearly* identical
since the filesystem was shutdown by the kernel immediately following
the failures.
2. I was able to read from all the drives.
3. Linux software raid :)

I just told mdadm to shove the darn thing together and then ran xfs_repair.

Hopefully, you can get data off the most recently failed drive.


On Wed, Sep 9, 2009 at 9:02 AM, Eric C. Aiken<ericaiken at gmail.com> wrote:
> I seeking advice on repairing a broken RAID 5 Array.I have a 6 disk RAID 5
> array that lost a second drive.
> There are a number of commercial-ware products the report the ability to
> repair the array.  I'm not sure of their abilities and secondly they all
> seem windows NTFS focused.  What may complicate the is issue is the
> filesystem is XFS.
> There are a few folks who have repaired their arrays by dd'ing the
> individual disk to  images files and rebuilding from there.  I like to hear
> anybody else's experience with repair broken arrays.  Any tools (commercial,
> open source, shareware), processes or any other good's and bad's you might
> have experienced.
> Thanks
> Eric C. Aiken
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