There is an issue in os-brick related to multipath support for iSCSI connector. Basically when multipathd is configured with feature 'find_multipaths' set to 'yes' #1815844 [0]. In this situation, multipathd automatically generate multipath device when it discovers: - There are at least two non-blacklisted paths with the same WWID. - The user manually forces the creation of the device by specifying a device with the multipath command. - A path has the same WWID as a multipath device that was previously created (even if that multipath device does not currently exist). Whenever a multipath device is created, multipath remembers the WWID of the device so that it will automatically create the device again as soon as it sees a path with that WWID. This situation happens as described in bug #1815844 [0] when we attach a volume, detach it and then re-attach it again. openstack volume create pure2 --size 10 --type pure openstack server add volume T1 pure2 openstack server remove volume T1 pure2 openstack server add volume T1 pure2 A patch has been proposed to fix the support [1]. Since we have workaround when 'find_multipaths' is set to 'no'. The question is: do we want to fix it? If not, I suggest to document it, that this feature from multipathd should be disabled. Probably a side-note in the config option 'volume_use_multipath' can help. We could also add a log warning in os-brick when we detect the issue. Thanks, s. [0] https://bugs.launchpad.net/charm-nova-compute/+bug/1815844 [1] https://review.openstack.org/#/c/638639/ [2] https://docs.openstack.org/nova/rocky/configuration/config.html#libvirt.volu...