Open Stack

> From: mikalstill at gmail.com <mikalstill at gmail.com> on behalf of Michael Still <mikal at stillhq.com>
> Sent: Wednesday, July 22, 2015 9:56 AM
> To: Mike Dorman
> Cc: openstack-operators at lists.openstack.org; Andrew Laski
> Subject: Re: [Openstack-operators] Nova cells v2 and operational impacts
> 
> Heya.
> 
> On Wed, Jul 22, 2015 at 9:21 AM, Mike Dorman <mdorman at godaddy.com> wrote:
>> Seems reasonable.
>> 
>> For us already running v1, will we be creating another new cell database
>> for v2?  Or will our existing v1 cell database become that second database
>> under v2?
> 
> Yes. Cells v2 will require a new database, you wont be able to reuse
> your existing cells database.

The direction we're going is that your databases within a cell will 
remain but the global database that cells v1 replicates data up into 
will be replaced by the new api database.

> 
>> Somewhat beyond the scope of this thread, but my main concern is the
>> acrobatics going from v1 in Kilo to the hybrid v1/v2 in Liberty, to full
>> v2 in Mitaka.  I think we all realize there will be some amount of pain to
>> get to v2, but as long as that case for us existing cells users can be
>> handled in a somewhat sane way, I’m happy.
> 
> I'm actually not too concerned about that bit, but then again I'm not
> the primary developer on cells v2 so I might be confused. I don't
> think we've documented the intended transition from cells v1 to cells
> v2 in M, but perhaps Andrew Laski can chime in?

The transition path isn't fully determined and documented yet, but it 
will be sane for both current cells and non cells deployments.  I 
personally will need to deal with the cells v1 to v2 transition so it 
will definitely be something that's thought about during development.

It's too early to get into details because multiple cells support isn't 
being worked on in this cycle, but ideally the migration for cells v1 
and non cells will be essentially the same except that cells v1 users 
may need to run an upgrade script in each cell vs just running it once.

> 
> Michael
> 
> --
> Rackspace Australia