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.
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