[linux-lvm] LVM snap size weirdness...
Alasdair G Kergon
agk at uk.sistina.com
Fri Mar 21 11:51:01 UTC 2003
On Fri, Mar 21, 2003 at 12:19:34PM -0500, Barry, Christopher wrote:
> So, by quiesce, would you suggest then, that I stop samba, nfs, apache -
> take a snapshot and immediately restart them? Then, fire off my backups?
The answer is going to be different for each application!
In general for an application that modifies files, yes, stop it,
take the snapshot, then restart it.
But, for example, if the application only reads the data, or only
appends to files, or has its own internal checkpointing you shouldn't
need to.
It's not really NFS that needs stopping: it's any applications
on your remote machines that are writing to the NFS-mounted volumes.
It's good that you're thinking about this: many people don't, and
subsequently discover when they restore data from their backups
that their applications think it's corrupt.
Alasdair
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