[CentOS] question(s) about LVM snapshots
Tony Schreiner
schreian at bc.edu
Fri Oct 12 14:35:14 UTC 2007
>
> 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
--- Logical volume ---
LV Name /dev/vg_data/lv_backup
VG Name vg_data
LV UUID B0F6Gw-iVTt-jJ38-nFny-B2lF-QWei-hqJNlT
LV Write Access read/write
LV snapshot status active destination for /dev/vg_data/lv_data
LV Status available
# open 1
LV Size 812.89 GB
Current LE 208100
COW-table size 143.45 GB
COW-table LE 36724
Allocated to snapshot 0.00% <<<<<--------
Snapshot chunk size 8.00 KB
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:1
Tony
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