Re: change from raid 5 to raid 6 interrupted

Re: change from raid 5 to raid 6 interrupted

am 22.04.2011 16:49:48 von rapmue

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Hi

last week i tried to grow my raid 5 with 4 disks to a raid 6 with 5
disks. accidentialy i dropped the powersource and the resync process
stopped.

i could start the nas with a rescue stick, but i still wasnt' able to
complete the resync. there are some output from different commands
(examine and assemble tries)

i'm very confused, because there stands active sync, but raid 6 and i
think since it was very at the beginning, there was no data changed on
the 4 raid 5 disks.

what should i do? and is it possible to rebuild this array? luckily i
have somewhere around 90% of the data backed up on another nas.

thank you in advance

Raphael

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Re: change from raid 5 to raid 6 interrupted

am 22.04.2011 17:05:01 von John Robinson

On 22/04/2011 15:49, Raphael Müller wrote:
> last week i tried to grow my raid 5 with 4 disks to a raid 6 with 5
> disks. accidentialy i dropped the powersource and the resync process
> stopped.
>
> i could start the nas with a rescue stick, but i still wasnt' able to
> complete the resync. there are some output from different commands
> (examine and assemble tries)
>
> i'm very confused, because there stands active sync, but raid 6 and i
> think since it was very at the beginning, there was no data changed o=
n
> the 4 raid 5 disks.
>
> what should i do? and is it possible to rebuild this array? luckily i
> have somewhere around 90% of the data backed up on another nas.

The end of the assemble output has the answer:
> mdadm:/dev/md1 has an active reshape - checking if critical section n=
eeds to be restored
> mdadm: Failed to find backup of critical section
> mdadm: Failed to restore critical section for reshape, sorry.
> Possibly you needed to specify the --backup-file

You need to manually re-issue the assemble command, and specify the=20
--backup-file you gave when you started the --grow. That should get the=
=20
array assembled and the reshape running again.

Cheers,

John.

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Re: change from raid 5 to raid 6 interrupted

am 22.04.2011 17:23:19 von John Robinson

(Please always remember to cc the list when replying; cc readded)

On 22/04/2011 16:09, Raphael Müller wrote:
> Ok i forgot to say, that the backup file is also gone... (my mistake)
>
> is this backup file the only option i got?

Without the backup file you've almost certainly lost some data. I=20
suspect there is a way of restarting the array and reshape without the=20
backup file, but I don't know what it is - you'll have to wait for a=20
proper guru to get back to you with an answer.

Cheers,

John.
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