LVM snapshot not mountable

LVM snapshot not mountable

[Michael Monnerie]

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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?

-- 
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc

it-management Internet Services
http://proteger.at [gesprochen: Prot-e-schee]
Tel: 0660 / 415 65 31

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Re: LVM snapshot not mountable

[Christoph Hellwig]

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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Re: LVM snapshot not mountable

[Emmanuel Florac]

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Le Tue, 25 May 2010 17:25:44 +0200
Michael Monnerie <michael.monnerie@is.it-management.at> écrivait:

> but the mount fails, dmesg says:
> [  598.440324] XFS: Filesystem dm-1 has duplicate UUID - can't mount
> 
> How could I mount it?

Simply read the message : you cannot mount 2 xfs filesystems with the
same UUID at the same time. Obviously the snapshot carries the same UUID
as the original. Use the "nouuid" option to mount it.

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Re: LVM snapshot not mountable

[Michael Monnerie]

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On Dienstag, 25. Mai 2010 Christoph Hellwig wrote:
> mount -o ro,norecovery,nouuid /dev/db/dbnap /mnt
> or use
>  xfs_admin -U generate /dev/db/dbnap

Gracias, merci, grazie, danke, thanks.

-- 
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc

it-management Internet Services
http://proteger.at [gesprochen: Prot-e-schee]
Tel: 0660 / 415 65 31

// Wir haben im Moment zwei Häuser zu verkaufen:
// http://zmi.at/langegg/
// http://zmi.at/haus2009/

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