On Wed, Aug 25, 2021 at 1:55 AM Massimo Sgaravatto <massimo.sgaravatto@gmail.com> wrote:

Dear all

In our Cloud we have multiple backends for Cinder. One of them is using the Dell EMC PS Series volume driver

My understanding (reading https://docs.openstack.org/releasenotes/cinder/ussuri.html) is that the driver doesn't work anymore in >= Ussuri

A while ago we migrated to Train (using CentOS7 as operating system) and everything kept working fine.
We are now trying to migrate to CentOS8 (still using Train) and the cinder volume service for the equallogic backend doesn't work anymore
In the log file I found something like this [*]

We already planned to dismiss that backend (but we planned to do that before next Openstack update).

Does anyone know if that driver is supposed to work with Train and CentOS8 (and therefore python3) ?

Hi Massimo,

Per [1] and [2], Dell EMC deprecated their PS driver in Stein with the intention of removing it in Train. So no, the driver was not intended to work in Train. Dell EMC didn't address py3 issues because of their intent to remove the driver in Train.

It turns out they didn't actually remove the driver in Train, but they did so in Ussuri [3]. But I would consider the driver to be non-functional in Train.

[1] https://review.opendev.org/c/openstack/cinder/+/603441

[2] https://review.opendev.org/c/openstack/cinder/+/603441/6/releasenotes/notes/dell-emc-ps-deprecation-ae8d166e1847ea94.yaml

[3] https://review.opendev.org/c/openstack/cinder/+/703839

Alan

Thanks, Massimo

[*]
021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps [req-9fee10a8-4ad4-4bb3-a04c-46ef6919bb0f - - - - -] Error running command.: TypeError: must be str, not bytes
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps Traceback (most recent call last):
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps   File "/usr/lib/python3.6/site-packages/cinder/volume/drivers/dell_emc/ps.py", line 248, in _run_ssh
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps timeout=self.configuration.ssh_conn_timeout)
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps   File "/usr/lib/python3.6/site-packages/cinder/volume/drivers/dell_emc/ps.py", line 72, in __inner
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps     res = gt.wait()
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps   File "/usr/lib/python3.6/site-packages/eventlet/greenthread.py", line 181, in wait
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps     return self._exit_event.wait()
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps   File "/usr/lib/python3.6/site-packages/eventlet/event.py", line 125, in wait
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps     result = hub.switch()
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps   File "/usr/lib/python3.6/site-packages/eventlet/hubs/hub.py", line 298, in switch
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps     return self.greenlet.switch()
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps   File "/usr/lib/python3.6/site-packages/eventlet/greenthread.py", line 221, in main
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps     result = function(*args, **kwargs)
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps   File "/usr/lib/python3.6/site-packages/cinder/volume/drivers/dell_emc/ps.py", line 196, in _ssh_execute
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps     self._get_output(chan)
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps   File "/usr/lib/python3.6/site-packages/cinder/volume/drivers/dell_emc/ps.py", line 175, in _get_output
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps     out += ret
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps TypeError: must be str, not bytes
2021-08-25 10:13:06.637 30932 ERROR cinder.volume.drivers.dell_emc.ps