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On 4/6/2018 5:09 AM, Matthew Booth wrote:
> I think you're talking at cross purposes here: this won't require a
> swap volume. Apart from anything else, swap volume only works on an
> attached volume, and as previously discussed Nova will detach and
> re-attach.
> 
> Gorka, the Nova api Matt is referring to is called volume update
> externally. It's the operation required for live migrating an attached
> volume between backends. It's called swap volume internally in Nova.

Yeah I was hoping we were just having a misunderstanding of what 'swap 
volume' in nova is, which is the blockRebase for an already attached 
volume to the guest, called from cinder during a volume retype or migration.

As for the re-image thing, nova would be detaching the volume from the 
guest prior to calling the new cinder re-image API, and then re-attach 
to the guest afterward - similar to how shelve and unshelve work, and 
for that matter how rebuild works today with non-root volumes.

-- 

Thanks,

Matt