From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: and again: broken RAID5
Date: Thu, 10 May 2012 20:45:16 +1000
Message-ID: <20120510204516.16571810@notabene.brown>
References: <4FAB7739.9000907@cgv.tugraz.at>
	<20120510192016.49cb9003@notabene.brown>
	<4FAB9632.5010206@anonymous.org.uk>
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To: John Robinson <john.robinson@anonymous.org.uk>
Cc: Lars Schimmer <l.schimmer@cgv.tugraz.at>, linux-raid@vger.kernel.org
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On Thu, 10 May 2012 11:19:30 +0100 John Robinson
<john.robinson@anonymous.org.uk> wrote:

> On 10/05/2012 10:20, NeilBrown wrote:
> > On Thu, 10 May 2012 10:07:21 +0200 Lars Schimmer<l.schimmer@cgv.tugraz.=
at>
> > wrote:
> [...]
> >> mdadm -E tells me e.g. for md1:
> >>
> >> /dev/sdh1:
> >> Events : 206286
> >>
> >> /dev/sdf1:
> >> Events : 206273
> >>
> >> /dev/sdi1:
> >> Events : 197114
> >>
> >> /dev/sdj1:
> >> Events : 206286
> [...]
> >>
> >>
> >> So all 4 disks see some diff state. Any chance on getting raid5
> >> running again and read some data from it?
> >>
> >> Does the mdadm -C --assume-clean option help me in that case anyhow?
> >
> > Just add --force the to --assemble command.
>=20
> I think I'd assemble from only 3 drives, sdh, sdf and sdj, because sdi's=
=20
> event count is so much lower it must be the one that was knocked out=20
> first and you probably want to resync onto it (or a fresh drive if it's=20
> actually faulty).

correct.  And that is exactly what "mdadm --assemble --force" will decide
too. :-)
It will assemble from h, f, j and exclude i.

NeilBrown

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