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On 09/23/15 at 01:45pm, John Griffith wrote:
<snip>
>
>​To be honest this is probably my fault, AZ's were pulled in as part of the
>nova-volume migration to Cinder and just sort of died.  Quite frankly I
>wasn't sure "what" to do with them but brought over the concept and the
>zones that existing in Nova-Volume.  It's been an issue since day 1 of
>Cinder, and as you note there are little hacks here and there over the
>years to do different things.
>
>I think your question about whether they should be there at all or not is a
>good one.  We have had some interest from folks lately that want to couple
>Nova and Cinder AZ's (I'm really not sure of any details or use-cases here).
>
>My opinion would be until somebody proposes a clear use case and need that
>actually works that we consider deprecating it.

I've heard some discussion about trying to use coupled AZs in order to 
schedule volumes close to instances.  However I think that is occurring 
because it's possible to do that, not because that would be a good way 
to handle the coordinated scheduling problem.