[linux-lvm] LVM snap size weirdness...
Barry, Christopher
cbarry at infiniconsys.com
Thu Mar 20 16:00:02 UTC 2003
Joe (the Magician),
Thanks, for the insight on exactly what snapshots are doing. I was unaware that snapshots were updated by deltas (or, more precisely, only are the deltas) - I thought they were a static view of the volume at 'x' point in time. Guess that's why it only took a few secs to make!
Another question:
When a backup program grabs files from the snapshot volume, is it subject to open file issues that are normally a problem during backups?
--
Christopher Barry
Manager of Information Systems
InfiniCon Systems
http://www.infiniconsys.com
-----Original Message-----
From: Joe Thornber [mailto:joe at fib011235813.fsnet.co.uk]
Sent: Thursday, March 20, 2003 3:31 PM
To: linux-lvm at sistina.com
Subject: Re: [linux-lvm] LVM snap size weirdness...
On Thursday, March 20, 2003, at 08:00 PM, Barry, Christopher wrote:
> I have dumped an ls of both the snap lv and the home lv and diffed
> them - no differences.
> Why/how can df be confused?
It's magic ;) Think of the filesystem that df is looking at as a
combination of the original volume with some modifications held in the
snapshot volume.
- Joe
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