Hi Libvirt,
Does libvirt-python currently support the creation of external snapshots?  I ran

where xml is

  <description>Snapshot of OS install and updates</description>
    <disk name='vda'>
            <source file='/home/potato/libvirt/backups/test-snap1.qcow2'/>

And got the following error:
    if ret is None:raise libvirtError('virDomainSnapshotCreateXML() failed', dom=self)
libvirt.libvirtError: unsupported configuration: disk 'vda' must use snapshot mode 'internal'

Is this expected?  Thanks!

Roger Jin