RE: [linux-lvm] LVM snap size weirdness...

["Barry, Christopher" <cbarry infiniconsys com>]

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 fib011235813 fsnet co uk]
Sent: Thursday, March 20, 2003 3:31 PM
To: linux-lvm 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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