Re: I just trashed my RAID5 array - recovery possible?

On Thursday March 20, lists@xxxxxxxxxxx wrote:
> 
> And when I try to mount the array:
> --8<--
> EXT3-fs error (device md(9,1)): ext3_check_descriptors: Block bitmap for 
> group 509 not in group (block 4294967295)!
> EXT3-fs: group descriptors corrupted !
> --8<--
> 
> What should I do now? Raidhotadd the 4th device? Run e2fsck prior to
> that or afterwards?

I would 
   fsck -n /dev/md1
to non-distructively see how much damage there is.

If that shows an uncomfortable large amount of damage, you could
assembling the array from a different triple of devices.
It is currently assemble from
   /dev/hd[gki]1

If you want to try g, k and e for example, use
  mdadm -Af /dev/md1 /dev/hd[gke]1

and then try "fsck -n" on that.

I wouldn't hot-add the fourth drive until you have decided you will
live with whatever you have.

NeilBrown
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