[ovirt-users] Default VM Disk Format is RAW ??

Hi, I have checked and found that ovirt support two type of disk formats (RAW & QCOW2)...but bydefault it create the VM disk with RAW format....i try but didn't find any way to change this format to qcow2 ?? How i can change the default vm disk from RAW to QCOW2 ?? I am using the below :- Ovirt :- 3.4.3 Glusterfs :- 3.5 Thanks, Punit