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 _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos
