Comment 10 for bug 1209199

jingsong,

What has happened here is that you are manually creating a volume then snapshotting it then creating a volume from snapshot. This sequence is automatically performed when doing a 'cinder create --source-volid <id> <size>' but with different logic. So what has happened here is that the snapshots you created are not considered 'clone' snapshots and, therefore, are not tracked under max_clone_depth. I suggest that if you want to clone volumes, do the create from the source vol direct as opposed to explicitly creating a snapshot and creating a volume from snap.