From mboxrd@z Thu Jan  1 00:00:00 1970
From: John Robinson <john.robinson@anonymous.org.uk>
Subject: Re: How to remove non-existant device
Date: Thu, 23 Sep 2010 14:16:19 +0100
Message-ID: <4C9B5323.3020201@anonymous.org.uk>
References: <20100923073029.GD19538@scavenger.homeip.net>
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To: Benjamin Schieder <blindcoder@scavenger.homeip.net>
Cc: linux-raid@vger.kernel.org
List-Id: linux-raid.ids

On 23/09/2010 08:30, Benjamin Schieder wrote:
> Hi all.
>
> On a SLES 10 SP 3 x86_64 version I'm encountering the following problem:
>
> Two disks sda and sdb are in a RAID 1 configuration. When pulling one
> disk and replacing it it becomes sdc instead of sda. The RAID is now
> degraded:
>
> kblhbe101:~ # cat /proc/mdstat
> Personalities : [raid1] [raid0] [raid5] [raid4] [linear]
> md2 : active raid1 sda8[2](F) sdb8[1]
>        286125568 blocks [2/1] [_U]
>
> md0 : active raid1 sda5[2](F) sdb5[1]
>        529984 blocks [2/1] [_U]
>
> md3 : active raid1 sda7[2](F) sdb7[1]
>        4200896 blocks [2/1] [_U]
>
> md1 : active raid1 sda6[2](F) sdb6[1]
>        2104384 blocks [2/1] [_U]
>
> unused devices:<none>
>
> But now I can't remove the sda partitions from the RAID:
> kblhbe101:~ # mdadm /dev/md0 -r /dev/sda5
> mdadm: cannot find /dev/sda5: No such file or directory
> kblhbe101:~ # mdadm /dev/md0 -r sda5
> mdadm: cannot find sda5: No such file or directory
>
> What am I doing wrong here?
> kblhbe101:~ # mdadm --version
> mdadm - v2.6 - 21 December 2006

Try `mdadm /dev/md0 -r missing`.

Cheers,

John.