Hello all we are testing openstack queens cinder driver for Unity iscsi (driver cinder.volume.drivers.dell_emc.unity.Driver).

The unity storage is a Unity600 Version 4.5.10.5.001

We are facing an issue when we try to detach volume from a virtual machine with two or more volumes attached (this happens often but not always):

The following is reported nova-compute.log:

2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server self.connector.disconnect_volume(connection_info['data'], None)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/os_brick/utils.py", line 137, in trace_logging_wrapper
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server return f(*args, **kwargs)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 274, in inner
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server return f(*args, **kwargs)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/iscsi.py", line 848, in disconnect_volume
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server device_info=device_info)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/iscsi.py", line 892, in _cleanup_connection
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server path_used, was_multipath)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/os_brick/initiator/linuxscsi.py", line 271, in remove_connection
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server self.flush_multipath_device(multipath_name)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/os_brick/initiator/linuxscsi.py", line 329, in flush_multipath_device
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server root_helper=self._root_helper)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/os_brick/executor.py", line 52, in _execute
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server result = self.__execute(*args, **kwargs)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/os_brick/privileged/rootwrap.py", line 169, in execute
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server return execute_root(*cmd, **kwargs)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_privsep/priv_context.py", line 207, in _wrap
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server return self.channel.remote_call(name, args, kwargs)
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_privsep/daemon.py", line 202, in remote_call
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server raise exc_type(*result[2])
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server ProcessExecutionError: Unexpected error while running command.
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server Command: multipath -f 36006016006e04400d0c4215e3ec55757
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server Exit code: 1
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server Stdout: u'Jan 17 16:04:30 | 36006016006e04400d0c4215e3ec55757p1: map in use\nJan 17 16:04:31 | failed to remove multipath map 36006016006e04400d0c4215e3ec55757\n'
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server Stderr: u''
2020-01-17 16:05:11.132 6643 ERROR oslo_messaging.rpc.server

Best Regards

Ignazio