Re: add another disk to existing raid 0, ie grow raid 0 possible?

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Hi,
It really might be fixed in recent code, just for consistency:

dpkg -l | grep mdadm
ii  mdadm                                         3.2.3-2                          tool to administer Linux MD arrays
(software RAID)

uname -a
Linux hanna64 3.1.0-1-amd64 #1 SMP Tue Jan 10 05:01:58 UTC 2012 x86_64 GNU/Linux



Cheers,
- -Nik

On 02/16/2012 08:55 AM, NeilBrown wrote:

On Tue, 14 Feb 2012 11:43:30 +0200 Nikolay Kichukov [off-list ref]
wrote:

quoted

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quoted

Hello Neil,
Here is the result, I think I managed to reproduce it as it has converted the raid0 to raid4.

quoted

so commands in sequence:

quoted

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.

quoted

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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