Disk cloning

[Ryan Bair]

It's supposed to sync before the snapshot, yes. The whole idea is that
the snapshot is consistent with the disk at the point in time the
snapshot was taken which makes it leaps and bounds better than just
running dd/rsync/tar on the raw volume. Consistent backups are the
only reason LVM has snapshots as the current implementation is pretty
useless for anything else.

To the database it will be just like if you pulled the plug at that
exact moment that you took the snapshot. Any database worth using
_will_ be able to recover and continue on its merry way when you start
up from the backup. Not so sure about MySQL though. :-)

--Ryan

On Wed, Jan 21, 2009 at 4:55 AM, Tino Schwarze
<linux-poweredge.lists at tisc.de> wrote:
> Hi,
>
> On Tue, Jan 20, 2009 at 04:35:37PM -0500, Ryan Bair wrote:
>
>> Are your active volumes on LVM? If so an LVM snapshot will make this
>> much easier. (Didn't see this mentioned yet, but it is a huge thread)
>
> An LVM snapshot is probably only slightly better than dd. It won't give
> you a consistent database storage either. It might do a sync on the file
> systems but I'm not sure.
>
> Tino.
>
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