version: OpenStack Compute (nova) 2014.1 "icehouse"
stack traces:
2015-02-02 09:33:10.936 10739 ERROR oslo.messaging.rpc.dispatcher [req-33c22474-43a2-4d27-815c-ef6432ccfe82 4ae3fd1b211349498fbe3aaed423d653 71f90f295e8d40a4b1638049ce07c697 - - -] Exception during message handling: Bad or unexpected response from the storage volume backend API: Unable to terminate volume connection: _map_lun:get map group info fail.group name:HostGroup_R8949317243996453135 with ret code: 16916997
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 999, in terminate_connection
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher     raise exception.VolumeBackendAPIException(data=err_msg)
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: Unable to terminate volume connection: _map_lun:get map group info fail.group name:HostGroup_R8949317243996453135 with ret code: 16916997
2015-02-02 09:33:10.936 10739 TRACE oslo.messaging.rpc.dispatcher 
2015-02-02 09:33:10.937 10739 ERROR oslo.messaging._drivers.common [req-33c22474-43a2-4d27-815c-ef6432ccfe82 4ae3fd1b211349498fbe3aaed423d653 71f90f295e8d40a4b1638049ce07c697 - - -] Returning exception Bad or unexpected response from the storage volume backend API: Unable to terminate volume connection: _map_lun:get map group info fail.group name:HostGroup_R8949317243996453135 with ret code: 16916997 to caller
2015-02-02 09:33:10.937 10739 ERROR oslo.messaging._drivers.common [req-33c22474-43a2-4d27-815c-ef6432ccfe82 4ae3fd1b211349498fbe3aaed423d653 71f90f295e8d40a4b1638049ce07c697 - - -] ['Traceback (most recent call last):\n', '  File "/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply\n    incoming.message))\n', '  File "/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch\n    return self._do_dispatch(endpoint, method, ctxt, args)\n', '  File "/usr/lib/python2.7/site-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch\n    result = getattr(endpoint, method)(ctxt, **new_args)\n', '  File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 999, in terminate_connection\n    raise exception.VolumeBackendAPIException(data=err_msg)\n', 'VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: Unable to terminate volume connection: _map_lun:get map group info fail.group name:HostGroup_R8949317243996453135 with ret code: 16916997\n']