On Wed, 20 Nov 2013 20:46:21 +0100 kustep [off-list ref] wrote:

Hello Everyone,

is there an option to specifiy the "Unused Space : before=...."
Superblock information in mdadm -C ....?

 --data-offset=....

or 
  --data-offset=variable ... /dev/foo:16K  /dev/foo2:32K ....

You probably need mdadm 3.3.

NeilBrown

My Raid crashed due to a controller error, but I was able to make the
new superblock almost identical to the old one (using mdadm -C
--assume-clean --level=6 --raid-devices=11 --chunk=256K --metadata=1.2
--bitmap=None --size=195328588 --data-offset=128768 /dev/md0
/dev/mapper/disk[cdefmbjkh] missing). Looking at mdadm --examine the
only difference left is:
old layout: Unused Space : before=257456 sectors, after=197632 sectors
new layout: Unused Space : before=257448 sectors, after=197632 sectors

Is there an option to change that or anything else I can do to make the
layouts identical? The assembled raid refuses to mount, and I suspect
this difference to be the reason.

Thanks in advance
Stephan
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