From mboxrd@z Thu Jan  1 00:00:00 1970
From: Iustin Pop <iusty@k1024.org>
Subject: Re: reducing the number of disks a RAID1 expects
Date: Mon, 10 Sep 2007 11:55:57 +0200
Message-ID: <20070910095557.GA22549@teal.hq.k1024.org>
References: <46E49991.9000000@getsu.com> <46E4AC1A.3010509@sauce.co.nz> <46E4F2EA.3020901@getsu.com>
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To: "J. David Beutel" <jdb@getsu.com>
Cc: Richard Scobie <richard@sauce.co.nz>, Linux RAID Mailing List <linux-raid@vger.kernel.org>
List-Id: linux-raid.ids

On Sun, Sep 09, 2007 at 09:31:54PM -1000, J. David Beutel wrote:
> [root@samue ~]# mdadm --grow /dev/md5 -n2
> mdadm: Cannot set device size/shape for /dev/md5: Device or resource busy
>
> mdadm - v1.6.0 - 4 June 2004
> Linux 2.6.12-1.1381_FC3 #1 Fri Oct 21 03:46:55 EDT 2005 i686 athlon i386 
> GNU/Linux

I'm not sure that such an old kernel supports reshaping an array. The
mdadm version should not be a problem, as that message is probably
generated by the kernel.

I'd recommend trying to boot with a newer kernel, even if only for the
duration of the reshape.

regards,
iustin