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On Wed, Sep 19, 2012 at 1:14 PM, Day, Phil <philip.day at hp.com> wrote:

>  Thanks Joe,****
>
> ** **
>
> I was anticipating something more complex to be able to say when an
> aggregate should or shouldn’t be linked to the hypevisor and overlooked the
> obvious.    ****
>
> ** **
>
> So just to make sure I’ve  got it – on libvirt systems an aggregate can be
> used for anything (because of the NoOp in the driver), but on xen systems
> it’s still liked to the hypervisor pools ?
>

Libvirt can be used for anything.

And Xen can be a xen hypervisor pool or anything depending on the aggregate
metadata (
https://github.com/openstack/nova/blob/master/nova/virt/xenapi/pool.py#L80
https://github.com/openstack/nova/blob/master/nova/virt/xenapi/pool_states.py
)

> ****
>
> ** **
>
> Thanks****
>
> Phil****
>
> ** **
>
> *From:* Joe Gordon [mailto:jogo at cloudscaling.com]
> *Sent:* 19 September 2012 19:02
> *To:* Day, Phil
> *Cc:* openstack at lists.launchpad.net (openstack at lists.launchpad.net) (
> openstack at lists.launchpad.net)
> *Subject:* Re: [Openstack] Generalsied host aggregates in Folsom****
>
> ** **
>
> ** **
>
> On Wed, Sep 19, 2012 at 10:18 AM, Day, Phil <philip.day at hp.com> wrote:****
>
> Hi Folks,****
>
>  ****
>
> Trying to catch-up  (I’m thinking of changing my middle name to catch-up J
> ) with the generalisation of host aggregates – and looking at the code it
> looks to me as if the chain for adding a host to an aggregate still ends up
> calling the virt layer   ****
>
>  ****
>
> api/openstack/compute/contrib/aggregates/AggregateController/action()****
>
> compute/api/AggregateAPI/add_host_to_aggregate()****
>
> <RPC>****
>
> compute/manager/add_aggregate_host()****
>
> virt/add_to_aggregate()****
>
>  ****
>
> I thought the change was to be able to create aggregates that can be
> linked to a hypervisor concept, but could also just be a way of “tagging”
> hosts into pools for other scheduler reasons – am I missing somethign ?***
> *
>
> ** **
>
> The RPC component is there to ensure XenAPI still works.  In the libvirt
> driver, add_to_aggregate() is a noop.****
>
> ** **
>
> So you can create an aggregate that can be linked to a hypervisor but also
> as a way to tag hosts****
>
> ** **
>
>   ****
>
> Thanks,****
>
> Phil****
>
>  ****
>
>  ****
>
>  ****
>
>
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>  ** **
>
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