Comment 4 for bug 1917750

Final update today, with mpath disabled I get the behaviour seen in c#0 when the encrypted volume test failed:

$ openstack --os-compute-api-version 2.latest server create --flavor 1 --image cirros-0.5.1-x86_64-disk --host devstack-focal-cpu --network private test-1
$ openstack --os-compute-api-version 2.latest server create --flavor 1 --image cirros-0.5.1-x86_64-disk --host devstack-focal-cpu --network private test-2
$ openstack volume create --size 1 test-1
$ openstack volume create --size 1 test-2
$ openstack server add volume test-1 test-1

stack@devstack-focal-cpu:~/devstack $ ll /dev/disk/by-id/wwn-*
lrwxrwxrwx 1 root root 9 Mar 9 22:42 /dev/disk/by-id/wwn-0x60000000000000000e00000000010001 -> ../../sdb

$ openstack server add volume test-2 test-2

stack@devstack-focal-cpu:~/devstack $ ll /dev/disk/by-id/wwn-*
lrwxrwxrwx 1 root root 9 Mar 9 22:42 /dev/disk/by-id/wwn-0x60000000000000000e00000000010001 -> ../../sdc

I can't however reproduce any of the detach failures seen in the nova-live-migration job.

After a brief exchange on the ML I've posted the following WIP to move Focal based CI envs over to lioadm to try to avoid this:

WIP cinder: Default CINDER_ISCSI_HELPER to lioadm on Ubuntu
https://review.opendev.org/c/openstack/devstack/+/779624