RHEV 3.2 - Thinly provisioned guests are paused and not resumed due to AttributeError: 'Drive' object has no attribute 'format'

Issue

• VMs are totally off and cannot start.
• RHEV Manager is reporting vms are paused. These vms cannot be resumed.
• Thinly provisioned guests are paused but not resumed.
• Also unable to migrate guests to other hosts during this time.
• Following traceback present in the /var/log/vdsm/vdsm.log of a host:

55125 Thread-28::ERROR::2013-08-02 16:18:15,039::utils::416::vm.Vm::(collect) vmId=`ec433a36-881b-493a-9130-770de36e9c59`::Stats function failed: <AdvancedStatsFunction _highWrite at 0x10c6b90>
55126 Traceback (most recent call last):
55127   File "/usr/lib64/python2.6/site-packages/vdsm/utils.py", line 412, in collect
55128     statsFunction()
55129   File "/usr/lib64/python2.6/site-packages/vdsm/utils.py", line 287, in __call__
55130     retValue = self._function(*args, **kwargs)
55131   File "/usr/share/vdsm/libvirtvm.py", line 130, in _highWrite
55132     if not vmDrive.blockDev or vmDrive.format != 'cow':
55133 AttributeError: 'Drive' object has no attribute 'format'