[CentOS] question(s) about LVM snapshots
Antonio da Silva Martins Junior
asmartins at uem.br
Fri Oct 12 19:30:56 UTC 2007
----- "Tony Schreiner" <schreian at bc.edu> escreveu:
> >
> > When the snap shot volume is mounted, yes you can do df on it. But
> > that shows you the state of the volume you take the snapshot of at
> > the time of the snapshot. That's not what I want to know.
>
> Sorry to answer my own question, but I just learned, lvdisplay shows
> the amount currently used by the snapshot
>
> #lvdisplay /dev/vg_data/lv_backup
Hi Tony,
You can use "lvs" too:
#lvs
LV VG Attr LSize Origin Snap% Move Log Copy%
home sys -wi-ao 2.00G
opt sys owi-ao 250.00G
root sys -wi-ao 1.50G
usr sys -wi-ao 1.50G
var sys -wi-ao 2.00G
zcssnap sys swi-ao 150.00G opt 0.24
zimbrabkp sys -wi-ao 150.00G
"zcssnap" is a snapshot of "opt", and during the time spent to sync it with
"zimbrabkp" the "difference" between "opt" and it's snapshot was 0.24%, I
think this is what you are looking for.
Antonio.
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