From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roman Mamedov <rm@romanrm.net>
Subject: Re: raid1 recoverable after system crash?
Date: Thu, 7 Apr 2016 18:00:04 +0500
Message-ID: <20160407180004.53615913@natsu>
References: <1460033086.27740.145.camel@interlinx.bc.ca>
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To: "Brian J. Murrell" <brian@interlinx.bc.ca>
Cc: linux-raid@vger.kernel.org
List-Id: linux-raid.ids

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On Thu, 07 Apr 2016 08:44:46 -0400
"Brian J. Murrell" <brian@interlinx.bc.ca> wrote:

> # cat /proc/mdstat=C2=A0
> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [rai=
d4] [raid10]=C2=A0
> md0 : active raid1 sdd[0]
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A01953514496 blocks [2/1] [U_]
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
> md1 : active raid0 sdc[1] sdb[0]
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A01953524736 blocks super 1.2 512k chun=
ks
...
> Is my only option here to fail/remove /dev/md1 from the array and re-
> add it that way or is there a more graceful recovery possible here?

You do not have a write intent bitmap at md0, so re-add will not work. Seems
like you should --add it now, then after it rebuilds use --grow to add a
bitmap, so that in the future you could use -re-add.

As to why the situation occured in the first place, you should ensure that =
md1
assembles before md0. Perhaps by listing both arrays in /etc/mdadm/mdadm.co=
nf
in the order you need (and don't forget to re-generate initrd.img).

--=20
With respect,
Roman

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