From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: unused space before data offset mismatch
Date: Thu, 21 Nov 2013 14:33:30 +1100
Message-ID: <20131121143330.326f8d45@notabene.brown>
References: <528D118D.7090800@web.de>
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To: kustep <kustep@web.de>
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On Wed, 20 Nov 2013 20:46:21 +0100 kustep <kustep@web.de> wrote:

> Hello Everyone,
>=20
> is there an option to specifiy the "Unused Space : before=3D...."
> Superblock information in mdadm -C ....?

 --data-offset=3D....

or=20
  --data-offset=3Dvariable ... /dev/foo:16K  /dev/foo2:32K ....

You probably need mdadm 3.3.

NeilBrown

>=20
> 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=3D6 --raid-devices=3D11 --chunk=3D256K --metadata=
=3D1.2
> --bitmap=3DNone --size=3D195328588 --data-offset=3D128768 /dev/md0
> /dev/mapper/disk[cdefmbjkh] missing). Looking at mdadm --examine the
> only difference left is:
> old layout: Unused Space : before=3D257456 sectors, after=3D197632 sectors
> new layout: Unused Space : before=3D257448 sectors, after=3D197632 sectors
>=20
> 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.
>=20
> Thanks in advance
> Stephan
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