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 to confirm that the ceph rbd if support  qemu qcow2 format oneline snapshot , thanks a lot!