From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: raid10 issues after reorder of boot drives.
Date: Tue, 1 May 2012 20:18:54 +1000
Message-ID: <20120501201854.19f7def9@notabene.brown>
References: <4F9AFBC6.7070803@weboperative.com>
	<20120428080355.70585026@notabene.brown>
	<20120501094508.GA24134@nsrc.org>
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To: Brian Candler <B.Candler@pobox.com>
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On Tue, 1 May 2012 10:45:08 +0100 Brian Candler <B.Candler@pobox.com> wrote:

> On Sat, Apr 28, 2012 at 08:03:55AM +1000, NeilBrown wrote:
> > I'm afraid you've been bitten by a rather nasty bug which is present in=
 3.3
> > and got back ported to some -stable kernel.  The fix has been submitted=
 and
> > should be appearing in -stable kernels soon (maybe already).
>=20
> Do you happen to know if this bug was present in ubuntu 11.10, kernel
> versions 3.0.0-15-server or 3.0.0-16-server ?

I don't keep track of what ubuntu (or anyone but suse) put in their kernels,
sorry.

>=20
> I saw failures to assemble RAID6 arrays after unclean shutdowns on both of
> these, just in test environments.  If it happens again I'll send mdadm
> --examine output. I just tried to replicate it and failed :-(

To replicate:

 - create an array.
 - stop the array
 - assemble the array with at least one missing device e.g.:
    mdadm -A /dev/md0 /dev/sda1 /dev/sdb1
   if it was a 3-device array
 - check in /proc/mdstat that it is listed as "inactivate"
 - reboot
 - now "mdadm -E" the devices.  If the raid level is -unknown- then the bug
   has hit.

NeilBrown


>=20
> Regards,
>=20
> Brian.
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