Messages in this thread | | | Date | Thu, 12 Jul 2007 17:41:05 -0400 | From | Phil Turmel <> | Subject | Re: Problem recovering a failed RIAD5 array with 4-drives. |
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James wrote: [snip /] >>On Thu, Jul 12, 2007 at 08:49:15AM -0500, James wrote: >>>I've tried a few cautions things to bring the array back up with the three >>>good drives with no luck. >>> [snip /] > > mdadm --create --verbose /dev/md0 --assume-clean --level=raid5 --raid-devices=4 --spare-devices=0 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 > [snip /] > > I should have included more information. When I attempted to --assemble the > array I received the following: > > []# mdadm --assemble [--force --run] /dev/md0 /dev/sda1 /dev/sdb1 > [/dev/sdc1] /dev/sdd1 > mdadm: failed to RUN_ARRAY /dev/md0: Input/output error > > > From what I read I assumed I could use the --assume-clean option with --create > to bring the array back at least in some semblance of working order. > > I'd like to recover as much as possible from the RAID array. I actually have a > nice new SATA configuration sitting here waiting to receive the data. This > thing failed a day too early. I'm gnashing my teeth over this one. > > I'd truly appreciate any help/advice. > Hi James,
mdadm allows you to specify "missing" in place of a failed device when assembling or creating arrays, like so:
mdadm --assemble /dev/md0 --run \ /dev/sda1 /dev/sdb1 missing /dev/sdd1
I don't know if using --create has already trashed your array, but this is worth a try. You may also want to try --force with the above.
HTH,
Phil
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