[DRBD-user] Problem mounting lvm snapshot

Bart Coninckx bart.coninckx at telenet.be
Sat Oct 30 09:57:08 CEST 2010


On Thursday 28 October 2010 03:51:14 Stefan Seifert wrote:
> On Wednesday 27 October 2010 22:48:58 Bart Coninckx wrote:
> > On Wednesday 27 October 2010 22:36:06 Lewis Donzis wrote:
> > > The idea was not to use the snapshot as "the backup" but merely to use
> > > the snapshot on the secondary system as a source for other backups. 
> > > The idea was to use asynchronous replication so the performance hit
> > > during the backups won't affect the primary.
> > 
> > I see, though while using protocol C there still would be a performance
> > hit on the primary node (though depending on your RAID config maybe
> > minimal). But I see no way to backup a secondary DRBD node.
> 
> I don't see why a backup on the secondary node would not work as long as
> the volume you're snapshotting is underneath DRBD. In fact, I've done just
> that. The data is there after all. Only problem is, that it's in an
> unknown state. There may be writes in progress. But if your applications
> can reliably cope with this (like e.g. a good database should), it's
> certainly an option.
> 
> Regards,
> Stefan
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Yes, you're right, my bad - when it's secondary you snapshot it. But as you 
say, the state is unsure.

B.


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