Open Stack

> 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