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LVM snapshot not mountable

DISCUSSION Michael Monnerie 3 participants 4 messages May 25, 2010

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Michael Monnerie

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#0 lore raw

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?

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Michael Monnerie, Ing. BSc

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#1 lore raw
Quoted 8 lines · Michael Monnerie

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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#3 lore raw
In reply to Michael Monnerie

Le Tue, 25 May 2010 17:25:44 +0200
Michael Monnerie <[email protected]> écrivait:

Quoted 4 lines

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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#2 lore raw
In reply to Christoph Hellwig
Quoted 3 lines · 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.

Signature · 10 lines
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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