[libvirt] about ceph+qcow2+qemu(snapshot) support issue ?

[haiquan517 at sina.com]

Hi , 
     Could you pls help me ask one question ,  now we are testing a fuction , about Ceph+ qcow2+(qemu(snapshot) tec,   now we are running this command  print this error :       virsh snapshot-create-as --domain win08q2 --name snapwin08q2 --description "test ucsm+qcow2"error: operation failed: Error -5 while writing VM
     so we want
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