Re: RAID6 Array crash during reshape.....now will not re-assemble.

[NeilBrown <neilb@suse.com>]

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On Sat, Mar 12 2016, Another Sillyname wrote:

> Neil
>
> Thanks for the insight, much appreciated.
>
> I've tried what you suggested and still get stuck.
>
>>:losetup /dev/loop0 /tmp/foo/sdb1
>>:losetup /dev/loop1 /tmp/foo/sdc1
>>:losetup /dev/loop2 /tmp/foo/sdd1
>>:losetup /dev/loop3 /tmp/foo/sde1
>>:losetup /dev/loop4 /tmp/foo/sdf1
>>:losetup /dev/loop5 /tmp/foo/sdg1
>>:losetup /dev/loop6 /tmp/foo/sdh1
>
>
>>:mdadm --assemble --force --update=revert-reshape --invalid-backup /dev/md127 /dev/loop0 /dev/loop1 /dev/loop2 /dev/loop3 /dev/loop4 /dev/loop5 /dev/loop6
> mdadm: /dev/md127: Need a backup file to complete reshape of this array.
> mdadm: Please provided one with "--backup-file=..."
> mdadm: (Don't specify --update=revert-reshape again, that part succeeded.)
>
> As you can see it 'seems' to have accepted the revert command, but
> even though I've told it the backup is invalid it's still insisting on
> the backup being made available.
>
> Any further thoughts or insights would be gratefully received.

Try giving it a backup file too.
It doesn't matter what the contents of the file are because you have
told it the file is invalid.  But I guess it thinks it might still need
a file to write new backups to temporarily.

NeilBrown

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