Timothy J Massey wrote at about 15:40:05 -0400 on Tuesday, April 12, 2011:
 > "Jeffrey J. Kosowsky" <backuppc AT kosowsky DOT org> wrote on 04/10/2011 
 > 01:57:01 
 > PM:
 > 
 > > The only problem with dd is that you would generally need to either
 > > make a "snapshot" (e.g., using lvm2) or shutdown BackupPC and unmount
 > > the drives to assure a perfect partition copy.
 > 
 > You always have to unmount (for it to work correctly, anyway), whether 
 > you're dd'ing the partition raw or using LVM.  The difference with LVM is 
 > that you only have to have it umounted for a brief moment, and without it 
 > for the entire time of the DD.

Well with LVM, if you have a dedicated BackupPC partition, it should
be sufficient to make sure no backup (or backuppc nightly process) is
running and that you are not at one of the round-number o'clock wakeup
times, then just doing a 'sync' followed by a lvm-snapshot should be
sufficient. I agree though that unmounting would be simpler though and
less likely to make mistakes.

 > > I'm not sure though how a 'dd' of an lvm2 snapshot works and what you
 > > would need to do on the new drive to get it to mount.
 > 
 > The same thing you'd have to do in any other case:  mount it!  :)

Well with 'dd' I typically do *not* mount it. I do a dd on the
unmounted partition (to ensure it is stable). I guess my question is
whether I can do the same on an unmounted lvm partition using
/dev/lvm-pv/lvm-vg format. I imagine I can...

That being said, I have found that at least on my slow machines,
lvm-snapshots add a significant slowdown tax...

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