Evacuation results in multipath residue when use fc

[leon zhu]

My environment uses the OpenStack Pike，fibre Channel is used for back-end storage，when we place 'volume_use_multipath=True' in nova.conf, we found that evacuation leads to multipath residue。
  Trace code through Debug，we find os-brick can not find volume_paths, So the residual multipath cannot be removed。
   By analyzing the code，the Volume_path acquired through FC is not in a local directory, because it's on the new node.
Repeat steps：
1.configure cinder backend storage as fc san and multipath;
2.boot vm from cinder volume;
3.evacuate vm;
4.execute commands at the old node to see the multipath,and you can see that vm multipath residue；

If the multipath residue will cause an error during vm migration，eg: commandexecutionfailed: failed to execute command emultipath -l /dev/sdbx .

[Brian Rosmaita (brian-rosmaita)]

The Pike release has reached EOL and no bugfixes are being provided for it. Please investigate upgrading to a more recent release.

[Balazs Gibizer (balazs-gibizer)]

Yeah it would help if have a clear reproduction steps on something closer to master. I'm setting this to Incomplete now.

[Balazs Gibizer (balazs-gibizer)]

Please set it back to new if you provided reproduction steps and the relevant logs.

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Elod Illes <email address hidden>" on branch: stable/pike
Review: https://review.opendev.org/c/openstack/os-brick/+/766676
Reason: Abandoning this patch, to be able to delete os-brick's stable/pike.

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Elod Illes <email address hidden>" on branch: stable/pike
Review: https://review.opendev.org/c/openstack/nova/+/766675
Reason: stable/pike has transitioned to End of Life for nova, open patches need to be abandoned in order to be able to delete the branch.