With NEC driver, when running non-disruptive backup using a temporary volume as LUN 0 it gave following error message.
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server [req-fd39d7d5-c0b0-47c3-a5d1-71f86b13182d 6212407db0ab46c8889a6c04817e0b75 e89019385ebb4a6b913d9c2d944f1e6a - default default] Exception during message handling: VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: Unable to fetch connection information from backend: Bad or unexpected response from the storage volume backend API: Command `iSMcfg addldsetld -ldset LX:edhat3dee8e45afb -ldname LX:7PVjAR1c6A1yCXaIxyAPlH_l -lun 0` failed.
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 265, in dispatch
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server return self._do_dispatch(endpoint, method, ctxt, args)
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 194, in _do_dispatch
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server result = func(ctxt, **new_args)
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server File "/usr/lib/python2.7/site-packages/cinder/volume/manager.py", line 1801, in initialize_connection_snapshot
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server raise exception.VolumeBackendAPIException(data=err_msg)
2019-11-08 07:58:24.370 58 ERROR oslo_messaging.rpc.server VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: Unable to fetch connection information from backend: Bad or unexpected response from the storage volume backend API: Command `iSMcfg addldsetld -ldset LX:edhat3dee8e45afb -ldname LX:7PVjAR1c6A1yCXaIxyAPlH_l -lun 0` failed.
Fix proposed to branch: master /review. opendev. org/693816
Review: https:/