Tested by:lvroyce test with cmd snapshot-create domain --disk-only ,patch works when qmp or hmp monitor accessible, Got trace below when issue cmd "snapshot-delete domain --snapshotname name",no "delvm/savevm" in qmp, only "delvm/savevm" commands in hmp.Is this for future compability? 2011-09-19 16:15:54.938: 25648: debug : qemuMonitorJSONIOProcessLine:115 : Line [{"id": "libvirt-11", "error": {"class": "CommandNotFound", "desc": "The command delvm has not been found", "data": {"name": "delvm"}}}] 2011-09-19 16:15:54.939: 25666: debug : virJSONValueToString:1071 : result={"execute":"human-monitor-command","arguments":{"command-line":"delvm \"1319011620\""},"id":"libvirt-12"} 2011-09-19 16:15:54.939: 25666: debug : qemuMonitorJSONCommandWithFd:224 : Send command '{"execute":"human-monitor-command","arguments":{"command-line":"delvm \"1319011620\""},"id":"libvirt-12"}' for write with FD -1