[nova][cinder] Why can't nova in stein work with cinder from queens?

Matt Riedemann mriedemos at gmail.com
Wed Nov 28 18:18:13 UTC 2018

On 11/28/2018 11:40 AM, Jay S Bryant wrote:
> We discussed this in our team meeting today and it appears that the 
> source of the problem is a misunderstanding based on Sean's commit message.
> Sean had made that comment because we only test N with N-1.  So, that is 
> the only tested configuration.  There is no reason that we know of, 
> however, that using Nova with older versions of Cinder wouldn't work. 
> Assuming that versioning works the way that it is supposed to, then 
> other combinations should work.  We, however, don't recommend using 
> combinations other than Nova at N and Cinder at N-1 as that is what is 
> tested.
> Let me know if you have further questions.

Cool, thanks Sean/Jay for discussing it.

As noted in the original email, I want to remove the old Cinder Queens 
compat code from the compute API in Stein anyway, so I plan on doing 
*something* there, at least dropping it and providing a release note - 
at most maybe a nova-status upgrade check to make sure Cinder 3.44 is 
available before upgrading to Stein.




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