vzdump --snapshot revisited
[root@svr~]# vzdump --snapshot 101 /dev/cdrom: open failed: No medium found starting backup for VPS 101 (/vz/private/101) Thu Jul 12 06:53:52 2007 creating backup for VPS 101 failed (0.00 minutes): unable to dump into snapshot (use option --dumpdir) at /usr/bin/vzdump line 450. What is going on? Here is the answer