[linux-lvm] Snapshot Info
James Pattinson
jamesp at foobarhouse.com
Tue Jul 31 11:20:02 UTC 2001
Hi
OK, I've got snapshots working now that I've re-created my PVs with beta8
tools.
Where can I find some more info about how snapshots work? I'm a bit
confused as to how space is allocated. Here's an example of what I'm
seeing:
I have a 3GB LV called /dev/vg00/lvol6 that is about half full.
1. Created a 512MB snapshot LV for this LV
2. Copied 9MB worth of data to /dev/vg00/lvol6
3. Looked at lvdisplay /dev/vg00/snap_lvol6 and 18MB is used in the
snapshot.
Where does the figure 18MB come from? is the fact that it is 2 x 9MB
significant?
I'd quite like to know how big I should be making my snapshots.
Cheers!!
James
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