On Thu, Feb 4, 2016 at 6:38 PM, Walter A. Boring IV <walter.bor...@hpe.com> wrote:
> My plan was to store the connector object at attach_volume time. I was > going to add an additional column to the cinder volume attachment table > that stores the connector that came from nova. The problem is live > migration. After live migration the connector is out of date. Cinder > doesn't have an existing API to update attachment. That will have to be > added, so that the connector info can be updated. > We have needed this for force detach for some time now. > > It's on my list, but most likely not until N, or at least not until the > microversions land in Cinder. > Walt > I think live migration should probably just be a second attachment - during the migration you have two attachments, then you detach the first. I think this is correct because as far as Cinder and the storage is concerned, there are two attachments. I think most of this mess started because we were trying to make the volume status reflect the status in Cinder and Nova. If the status reflects only Cinder's (and the storage backends') status, things because simpler. (Might need to pass an extra flag on the second attach to over-ride any "no multiattach" policies that exist.) -- *Avishay Traeger, PhD* *System Architect* Mobile: +972 54 447 1475 E-mail: avis...@stratoscale.com Web <http://www.stratoscale.com/> | Blog <http://www.stratoscale.com/blog/> | Twitter <https://twitter.com/Stratoscale> | Google+ <https://plus.google.com/u/1/b/108421603458396133912/108421603458396133912/posts> | Linkedin <https://www.linkedin.com/company/stratoscale>
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