[openstack-dev] [Nova] [Cells] Stupid question: Cells v2 & AZs

David Medberry openstack at medberry.net
Wed May 24 13:39:14 UTC 2017

Thanks Belmiro. So, when using Host Aggregates (haggs) as pure haggs, and
not as AZs, is their any conflict/interaction if we then enable AZs? This
is more of a philosophical question.

Thanks for answering the base question. So, if AZs are implemented with
haggs, then really, they are truly disjoint from cells (ie, not a subset of
a cell and not a superset of a cell, just unrelated.) Does that philosophy
agree with what you are stating?

Many thanks.


On Wed, May 24, 2017 at 12:38 AM, Belmiro Moreira <
moreira.belmiro.email.lists at gmail.com> wrote:

> Hi David,
> AVZs are basically aggregates.
> In cells_v2 aggregates are defined in the cell_api, so it will be possible
> to have
> multiple AVZs per cell and AVZs that spread between different cells.
> Belmiro
> On Wed, May 24, 2017 at 5:14 AM, David Medberry <openstack at medberry.net>
> wrote:
>> Hi Devs and Implementers,
>> A question came up tonight in the Colorado OpenStack meetup regarding
>> cells v2 and availability zones.
>> Can a cell contain multiple AZs? (I assume this is yes.)
>> Can an AZ contain mutliple cells (I assumed this is no, but now in
>> thinking about it, that's probably not right.)
>> What's the proper way to think about this? In general, I'm considering
>> AZs primarily as a fault zone type of mechanism (though they can be used in
>> other ways.)
>> Is there a clear diagram/documentation about this?
>> And consider this to be an Ocata/Pike and later only type of question.
>> Thanks.
>> -dave
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