linux-kernel - Re: MD-raid broken in 2.6.37.3?

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Message-ID: <20110309210251.744ef954@notabene.brown>
Date:	Wed, 9 Mar 2011 21:02:51 +1100
From:	NeilBrown <neilb@...e.de>
To:	Johan Hovold <jhovold@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: MD-raid broken in 2.6.37.3?

On Wed, 9 Mar 2011 10:06:22 +0100 Johan Hovold <jhovold@...il.com> wrote:

> Hi Greg and Neil,
> 
> I updated from 2.6.37.2 to 2.6.37.3 yesterday only to find that my
> raid-0 partitions are no longer recognised. The raid-1 ones still are,
> though. They did not show up after a reboot. (It has happened once
> fairly recently that these exact partitions were not recognised but a
> reboot fixed it -- blamed my disks.)
> 
> Today I mistakenly booted into 2.6.37.3 again -- still missing. No
> problems with 2.6.37.2.
> 
> Browsing the changelog I found f663ed60892c3e1d4490b079a45d9e546271c40c
> (md: Fix - again - partition detection when array becomes active) and
> other md-related changes so I figure one of these could perhaps be to
> blame?
> 
> As it is my personal/production machine I feel uncomfortable bisecting
> this at this point, but maybe Neil has an idea of what might be going
> on?

Hi Johan,

 could you please be a bit more specific about the problem that you
experienced.
What, exactly, was "no longer recognised"?

Was it that the array (e.g. /dev/md1) didn't appear, or was it that the
array did appear, but that it has a partition table, and the partitions
(e.g. /dev/md1p1, /dev/md1p2) did not appear?

If you still have the boot-log from when you booted 2.6.37.3 (or can
recreated) and can get a similar log for 2.6.37.2, then it might be useful to
compare them.

Thanks,
NeilBrown
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