Comment 0 for bug 2033398

During live migration, a timeout can happen due to some slowness when executing specific functions.

In order to reduce the slowness on the Dell PowerMax backend driver and to reduce the risk of long traffic disruptions when multiple detach and attach requests are invoked, the renaming of the device when detaching can be skipped as it will be deleted afterwards.

The current logic of the delete_volume function can cause slowness and break online migration.
https://github.com/openstack/cinder/blob/299553a4fe281cde9b14da34a470dcdb3ed17cc0/cinder/volume/drivers/dell_emc/powermax/rest.py#L1267

Please note that it only affects driver versions up through Xena as the change was done starting Zed.