Guess I am the village idiot today.
Maybe I am, now I had a closer look and have some questions. I have put -2 on https://review.openstack.org/29488 until it's clarified: * why is this an issue only in a particular driver? Do all other storage arrays allow multihost by default? * new config parameters are fine on stable if they preserve the current behaviour. In this case current behaviour is considered buggy and changed by default, but I'm not sure how is ensured that multihost attach is safe? Is there any locking preventing the same volume being used simultaneously from two nodes? * IMHO on stable we should be conservative and keep the current safer behaviour i.e. storwize_svc_multihostmap_enabled=False by default with an appropriate warning in the parameter description, so that users can change it but are also fully aware of the implications. It also requires an entry in the release notes. Cheers, Alan