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

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