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Re: LVM snapshot not mountable

To: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Subject: Re: LVM snapshot not mountable
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 25 May 2010 11:49:27 -0400
Cc: xfs@xxxxxxxxxxx
In-reply-to: <201005251725.48452@xxxxxx>
References: <201005251725.48452@xxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
On Tue, May 25, 2010 at 05:25:44PM +0200, Michael Monnerie wrote:
> This might be LVM specific, please apologize. For the first time I play 
> around with LVM snapshots. I tried this:
> lvcreate -s -n dbsnap -L 4G -v /dev/db/mysql
> mount /dev/db/dbnap /mnt
> but the mount fails, dmesg says:
> [  598.440324] XFS: Filesystem dm-1 has duplicate UUID - can't mount
> How could I mount it?

mount -o ro,norecovery,nouuid /dev/db/dbnap /mnt

or use

 xfs_admin -U generate /dev/db/dbnap

to give it a different uuid first in case you're dealing with a
writeable snapshot.

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