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On Tue, 14 Feb 2012 11:43:30 +0200 Nikolay Kichukov <hijacker@xxxxxxxxx>
wrote:
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> Hello Neil,
> Here is the result, I think I managed to reproduce it as it has converted the raid0 to raid4.
>
>
> so commands in sequence:
>
> mdadm --verbose --create /dev/md/mdtest --level=0 --raid-devices=2 --metadata=1.2 /dev/loop0 /dev/loop1
> mdadm: chunk size defaults to 512K
> mdadm: array /dev/md/mdtest started.
>
> strace -o /tmp/foo -f mdadm --grow /dev/md/mdtest --raid-devices=3 --add /dev/loop2
> mdadm: level of /dev/md/mdtest changed to raid4
> mdadm: /dev/loop2 not large enough to join array
> mdadm: Need to backup 3072K of critical section..
> mdadm: /dev/md/mdtest: Cannot grow - need a spare or backup-file to backup critical section
> mdadm: aborting level change
>
I tried exactly that and it worked perfectly.
Maybe the bug has been fixed.
Please remind me exactly which versions of mdadm and linux you are using.
Thanks,
NeilBrown
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