live migration and instance creation fails with "NoFibreChannelVolumeDeviceFound: Unable to find a Fibre Channel volume device." in HP3Par cinder backend

Issue

• live migration and instance creation fails with "NoFibreChannelVolumeDeviceFound: Unable to find a Fibre Channel volume device." in HP3Par cinder backend

2019-01-18 07:51:03.627 285661 WARNING os_brick.initiator.connectors.fibre_channel [-] Fibre Channel volume device not yet found. Will rescan & retry.  Try number: 0.
2019-01-18 07:51:05.625 285661 WARNING os_brick.initiator.connectors.fibre_channel [-] Fibre Channel volume device not yet found. Will rescan & retry.  Try number: 1.
2019-01-18 07:51:07.624 285661 WARNING os_brick.initiator.connectors.fibre_channel [-] Fibre Channel volume device not yet found. Will rescan & retry.  Try number: 2.
2019-01-18 07:51:09.622 285661 WARNING os_brick.initiator.connectors.fibre_channel [-] Fibre Channel volume device not yet found. Will rescan & retry.  Try number: 3.
2019-01-18 07:51:11.619 285661 WARNING os_brick.initiator.connectors.fibre_channel [-] Fibre Channel volume device not yet found. Will rescan & retry.  Try number: 4.
2019-01-18 07:51:13.619 285661 ERROR os_brick.initiator.connectors.fibre_channel [-] Fibre Channel volume device not found.
2019-01-18 07:51:13.619 285661 ERROR oslo.service.loopingcall [-] Fixed interval looping call 'os_brick.initiator.connectors.fibre_channel._wait_for_device_discovery' failed
2019-01-18 07:51:13.619 285661 ERROR oslo.service.loopingcall Traceback (most recent call last):
2019-01-18 07:51:13.619 285661 ERROR oslo.service.loopingcall   File "/usr/lib/python2.7/site-packages/oslo_service/loopingcall.py", line 136, in _run_loop
2019-01-18 07:51:13.619 285661 ERROR oslo.service.loopingcall     result = func(*self.args, **self.kw)
2019-01-18 07:51:13.619 285661 ERROR oslo.service.loopingcall   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 157, in _wait_for_device_discovery
2019-01-18 07:51:13.619 285661 ERROR oslo.service.loopingcall     raise exception.NoFibreChannelVolumeDeviceFound()
2019-01-18 07:51:13.619 285661 ERROR oslo.service.loopingcall NoFibreChannelVolumeDeviceFound: Unable to find a Fibre Channel volume device.
2019-01-18 07:51:13.619 285661 ERROR oslo.service.loopingcall 
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server [req-d0656815-46d3-4494-ae14-867cb826acd6 07330a460401434bb02fed5acb0e3d3c 1b6c62dd0a6a4f7c8917304292298cb0 - - -] Exception during message handling
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 133, in _process_incoming
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 150, in dispatch
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 121, in _do_dispatch
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 75, in wrapped
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     function_name, call_dict, binary)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     self.force_reraise()
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/exception_wrapper.py", line 66, in wrapped
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     return f(self, context, *args, **kw)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/utils.py", line 613, in decorated_function
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 216, in decorated_function
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     kwargs['instance'], e, sys.exc_info())
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     self.force_reraise()
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     six.reraise(self.type_, self.value, self.tb)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 204, in decorated_function
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     return function(self, context, *args, **kwargs)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 5230, in pre_live_migration
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     migrate_data)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 6807, in pre_live_migration
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     self._connect_volume(connection_info, disk_info, instance)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 1122, in _connect_volume
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     vol_driver.connect_volume(connection_info, disk_info, instance)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/volume/fibrechannel.py", line 53, in connect_volume
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     device_info = self.connector.connect_volume(connection_info['data'])
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/os_brick/utils.py", line 137, in trace_logging_wrapper
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py", line 271, in inner
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     return f(*args, **kwargs)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 171, in connect_volume
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     timer.start(interval=2).wait()
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 121, in wait
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     return hubs.get_hub().switch()
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 294, in switch
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     return self.greenlet.switch()
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_service/loopingcall.py", line 136, in _run_loop
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     result = func(*self.args, **self.kw)
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/os_brick/initiator/connectors/fibre_channel.py", line 157, in _wait_for_device_discovery
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server     raise exception.NoFibreChannelVolumeDeviceFound()
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server NoFibreChannelVolumeDeviceFound: Unable to find a Fibre Channel volume device.
2019-01-18 07:51:13.655 285661 ERROR oslo_messaging.rpc.server