Re: RAID6 array won't start

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On Fri, Feb 11, 2011 at 3:49 PM, NeilBrown <neilb@xxxxxxx> wrote:
> On Fri, 11 Feb 2011 11:48:41 -0500 Christian <cjs703@xxxxxxxxx> wrote:
>
>> Hello,
>>
>> I have a 10 disk RAID6 array.  I had an issue with a molex connector
>> that caused drives to drop from a 5in3 SATA backplane.  There wasn't
>> any activity occurring on the array during the time, so I think the
>> filesystem should be in tact.  The issue now is the event counts are
>> out of sync, along with the state of each drive.
>>
>> # mdadm -A /dev/md1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdk1 /dev/sdl1
>> /dev/sdm1 /dev/sdq1 /dev/sdr1 /dev/sds1 /dev/sdt1
>> mdadm: /dev/md1 assembled from 8 drives - not enough to start the
>> array while not clean - consider --force.
>>
>> # cat /proc/mdstat
>> Personalities : [raid6] [raid5] [raid4]
>> md1 : inactive sdt1[1](S) sde1[9](S) sdl1[8](S) sdg1[7](S) sdf1[6](S)
>> sdk1[5](S) sdq1[4](S) sds1[3](S) sdr1[2](S) sdm1[0](S)
>>       19535134720 blocks
>>
>>
>> # mdadm -Af /dev/md1 /dev/sde1 /dev/sdf1 /dev/sdg1 /dev/sdk1 /dev/sdl1
>> /dev/sdm1 /dev/sdq1 /dev/sdr1 /dev/sds1 /dev/sdt1
>> mdadm: failed to RUN_ARRAY /dev/md1: Input/output error
>
> The array is already in a partially-assembled state.
>
> mdadm -S /dev/md1
>
> before trying to assemble again with -f.
>
> NeilBrown

I should have probably included it but I did stop the array with -S
before running -Af.
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