NEC driver: non-disruptive backup failed

[Naoki Saito]

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.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/693816

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/train
Review: https://review.opendev.org/696463

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/696463
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=25cc53e43ef2ae4e862f96cdb867baae269bb512
Submitter: Zuul
Branch: stable/train

commit 25cc53e43ef2ae4e862f96cdb867baae269bb512
Author: Naoki Saito <email address hidden>
Date: Tue Nov 12 20:23:51 2019 +0900

    NEC driver: fix a non-disruptive backup error

    When attaching a snapshot to a node,
    NEC driver automatically creates and attaches LUN-0
    if the node does not have it yet.
    The LUN-0 is reserved for storage functions control.

    Currently, the driver does not update a LUN list after creating LUN-0
    and selects the already used LUN to attach the snapshot.
    That causes a non-disruptive backup error.

    This patch adds the LUN list update.
    The list is stored in `ldset' variable.

    Change-Id: I6d5d34ac802ecf6239f2d7e1a2a13c58ce5db263
    Closes-Bug: #1852201
    (cherry picked from commit 04f8e46659a4b29db3aec9832c608b350c3a63cc)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 15.0.1 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/cinder 16.0.0.0b1 development milestone.