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

[David Medberry]

Thanks all.

On Wed, May 24, 2017 at 8:08 AM, Dan Smith  wrote:

> > 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?
>
> Correct, aggregates are at the top level, and they can span cells if you
> so desire (or not if you don't configure any that do). The aggregate
> stuff doesn't know anything about cells, it only knows about hosts, so
> it's really independent.
>
> --Dan
>
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Re: [openstack-dev] [Nova] [Cells] Stupid question: Cells v2 & AZs

[Dan Smith]

> 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?

Correct, aggregates are at the top level, and they can span cells if you
so desire (or not if you don't configure any that do). The aggregate
stuff doesn't know anything about cells, it only knows about hosts, so
it's really independent.

--Dan

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

[David Medberry]

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.

-dave

On Wed, May 24, 2017 at 12:38 AM, Belmiro Moreira <
moreira.belmiro.email.li...@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 
> 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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>
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Re: [openstack-dev] [Nova] [Cells] Stupid question: Cells v2 & AZs

[Belmiro Moreira]

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

[David Medberry]

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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