Re: Update: mdadm 3.1.1 / 2.6.32 - trouble reducing active devices in 13TB RAID6

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On Mon, Apr 5, 2010 at 4:10 PM, Brett King <king.br@xxxxxxxxx> wrote:
> Another update: things didn't quite go as planned .. the reshape
> didn't quite finish - it got to 99.9% and stopped there:
>
> md0 : active raid6 sdq[0] sdc[12] sdb[11] sda[10] sdo[9] sdn[8] sdm[7]
> sdl[6] sdv[5] sdu[4] sdd[3] sds[2] sdr[1]
>      9767624960 blocks super 0.91 level 6, 64k chunk, algorithm 2
> [12/12] [UUUUUUUUUUUU]
>      [===================>.]  reshape = 99.9% (976761856/976762496)
> finish=0.0min speed=4K/sec
>
> I left it overnight hence the low speed average. A stop and restart
> using the backup-file also didn't end well:
>
> array:/tmp/mdadm-3.1.2 # ./mdadm -S /dev/md0
> mdadm: stopped /dev/md0
> array:/tmp/mdadm-3.1.2 # ./mdadm -A /dev/md0 --backup-file /export/md0-backup
> mdadm: Failed to restore critical section for reshape, sorry.
>
> (the backup-file isn't on the array being reshaped).
>
> Looks like the code's almost there but not quite .. there are 640
> remaining blocks.
>
> array:/tmp/mdadm-3.1.2 # uname -a
> Linux array 2.6.34-rc3-7-default #1 SMP 2010-03-31 17:12:53 +0200
> x86_64 x86_64 x86_64 GNU/Linux
> array:/tmp/mdadm-3.1.2 # ./mdadm -V
> mdadm - v3.1.2 - 10th March 2010
> array:/tmp/mdadm-3.1.2 #
>
> Any ideas ?
>
> Cheers,
> Brett.
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Anything useful/interesting in the dmesg output?
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