Hi, to get the real usage of an image I can run: rbd diff image1 | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }' To get the cow usage of a snapshot: rbd diff image1 --from-snap snap1 | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }' But I wonder how I can get the cow usage of a clone? I tried passing an absolute snapshot name "image1@snap1" but that doesn't work. rbd diff clone1 --from-snap image1@snap1 | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }' rbd: diff error: (2) No such file or directory Thanks for any help. Corin _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com