Re: reshape from raid5 to raid6 failed -- and backup file is gone?

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>
>
> It is very odd that the backup file disappeared.  What is
>   /.MEDIA/tmp
> ?? Not a tmpfs filesystem I hope...

No, a persistent filesystem on another disk -- with no autodelete
scripts or anything.  Very very weird that it disappeared.   I saw it
before I went to bed... was about 50MB if I recall.  Unless the fsck
at boot removed it -- but I would imagine you make sure you fsync that
file to disk before you proceed?   I think ./.MEDIA is ext4.

> You could hack mdadm to assemble the array even without a backup file.
> Get 'Grow_restart' to always return 0.
>
> Then most of your data should be assessible, but the could be a section in
> the middle which is currupt.

As long as fsck can bring it back to a consistent state, I'm ok with
that.   But I would guess some file contents could be silently
corrupt?
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