[IBM Storwize] Restore VM snapshot issue with replication volumes

[nikeshkm]

In reverting VM snapshot for replication volumes, the steps are:
1) stop relationship
2) restore
3) start relationship

If the replication volume is part of CG, step 1 is failing with following error:
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server res = self.dispatcher.dispatch(message)
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/dispatcher.py", line 309, in dispatch
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server return self._do_dispatch(endpoint, method, ctxt, args)
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/oslo_messaging/rpc/dispatcher.py", line 229, in _do_dispatch
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server result = func(ctxt, **new_args)
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/powervc_cinder/volume/manager.py", line 2398, in revert_volume_to_snapshot
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server LOG.exception(msg, msg_args)
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 227, in __exit__
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server self.force_reraise()
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server raise self.value
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/powervc_cinder/volume/manager.py", line 2368, in revert_volume_to_snapshot
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server self._revert_to_snapshot(context, volume, snapshot)
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/cinder/volume/manager.py", line 1055, in _revert_to_snapshot
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server self.driver.revert_to_snapshot(context, volume, snapshot)
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/cinder/volume/volume_utils.py", line 1413, in trace_logging_wrapper
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server return f(*args, **kwargs)
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server File "/usr/lib/python3.6/site-packages/cinder/volume/drivers/ibm/storwize_svc/storwize_svc_common.py", line 6448, in revert_to_snapshot
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server raise exception.VolumeBackendAPIException(data=msg)
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server cinder.exception.VolumeBackendAPIException: Bad or unexpected response from the storage volume backend API: Stop RC relationship has failed for volume-gmcv_volatt-1-d889a52f-6a49due to: Bad or unexpected response from the storage volume backend API: CLI Exception output:
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server command: ['svctask', 'stoprcrelationship', 'rcrel88']
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server stdout:
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server stderr: CMMVC5951E The operation cannot be performed because the relationship is not a stand-alone relationship.
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server ..
2021-12-03 06:02:56.675 663687 ERROR oslo_messaging.rpc.server

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/cinder/+/823015
Committed: https://opendev.org/openstack/cinder/commit/ea07317f08ac02b03f8dc638ec70869c0ceed228
Submitter: "Zuul (22348)"
Branch: master

commit ea07317f08ac02b03f8dc638ec70869c0ceed228
Author: sreerammounika <email address hidden>
Date: Tue Feb 8 06:24:27 2022 +0000

    [SVf] RevertToSnapshot for rep-volumes in group

    [Spectrum Virtualize family] Currently, SVf does not support
    Revert to Snapshot operation for replicated volumes which
    are a part of group. Added necessary code changes to
    storwize cinder driver to support this operation.

    Closes-Bug: #1953185
    Change-Id: I43a34e89914151a81c4ad64ac1486844032757fa

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 20.0.0.0rc1 release candidate.