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On Wed, Feb 10, 2016 at 11:16:28PM +0000, Fox, Kevin M wrote:
> I think part of the issue is whether to count or not is cinder driver specific and only cinder knows if it should be done or not.
> 
> But if cinder told nova that particular multiattach endpoints must be refcounted, that might resolve the issue?
> 
> Thanks,
> Kevin

I this case (the point John and I were making at least) it doesn't
matter. Nothing is driver specific, so it wouldn't matter which backend
is being used.

If a volume is needed, request it to be attached. When it is no longer
needed, tell Cinder to take it away. Simple as that.