Re: emergency call for help: raid5 fallen apart

["Stefan G. Weichinger" <lists@xunil.at>]

Am 24.02.2010 16:22, schrieb Robin Hill:
> On Wed Feb 24, 2010 at 04:05:36PM +0100, Stefan G. Weichinger wrote:
> 
>> Am 24.02.2010 15:54, schrieb Stefan G. Weichinger:
>>
>>> What to try?
>>>
>>> This is a crucial server and I feel a lot of pressure.
>>> Rebuilding that raid would mean a lot of restore-work etc.
>>> So I would really appreciate a goo advice here.
>>
>> Followup:
>>
>> --examine shows different statii for the four partitions:
>>
> Hmm, that looks like sda4 dropped out after sdc4 was removed, failing
> the array.  Can you force assemble the array?
>     mdadm -A /dev/md4 -f /dev/sda4 /dev/sdb4
> 
> If that works, you'll want to re-add the hot spare so it rebuilds.
> You'll also need to fsck the filesystem afterwards.

I thank you a lot for this piece of help.
I always hesitate to TRY things in such a situation as I once back then
dropped a RAID by doing the wrong thing.

The md4 is UP again on 2 spindles, 3rd re-added right now.

Looks promising.

THANKS, I owe you something.

I report back later with more details ...

S