On Friday 23 April 2010 22:33:49 B. Alexander wrote:
> However, for snapshotting to work, don't you have to have at least as much
> space for the snapshot as you do for the original partition? I currently am
> using nearly 60% of the VG just for backups, which is the root of the
> problem. It wasn't apparent in my scanning of the article (I'll go back and
> read for content in a bit).

No, you don't.  An LVM snapshot is a copy-on-write split from the original 
partition. You only need as much space in the snapshot as the amount of data 
that will change in the time that you need the snapshot.  If you will change 
only 20% of the data in the time it takes you to copy the snapshot and then 
remote it, you only need 20% of the volume group for the snapshot.

I've only run a few clones to a secondary location so far, all with BackupPC 
idle. We're about to install a new second server and I'll have some real test 
data to verify that fraction. But even the LVM docs say 10-30%.

Regards,
Tyler

-- 
"If they can get you asking the wrong questions, they don't have to
worry about answers."
   -- Thomas Pynchon

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