Description of problem:


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. create a string to store te xml desc(info=dom.XMLDesc(0)
2.create a snapshot of an active vm by using the dom.snapshotCreateXML(info,0)
3.
  
Actual results:
libvir: QEMU error : Requested operation is not valid: Disk '/home/pre/hda1.qcow2' does not support snapshotting
Traceback (most recent call last):
  File "try_fun2.py", line 63, in <module>
    print dom.snapshotCreateXML(info,0)
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 708, in snapshotCreateXML
    if ret is None:raise libvirtError('virDomainSnapshotCreateXML() failed', dom=self)
libvirt.libvirtError: Requested operation is not valid: Disk '/home/pre/hda1.qcow2' does not support snapshotting


Expected results:

snapshot of the image

Additional info: