[openstack-dev] [nova] Proposal: Move CPU and memory allocation ratio out of scheduler

Jay Pipes jaypipes at gmail.com
Mon Jun 9 14:01:37 UTC 2014

On 06/05/2014 09:54 AM, Day, Phil wrote:
>> -----Original Message----- From: Jay Pipes
>> [mailto:jaypipes at gmail.com] Sent: 04 June 2014 19:23 To:
>> openstack-dev at lists.openstack.org Subject: Re: [openstack-dev]
>> [nova] Proposal: Move CPU and memory allocation ratio out of
>> scheduler
>> On 06/04/2014 11:56 AM, Day, Phil wrote:
>>> Hi Jay,
>>>> * Host aggregates may also have a separate allocation ratio
>>>> that overrides any configuration setting that a particular host
>>>> may have
>>> So with your proposal would the resource tracker be responsible
>>> for picking and using override values defined as part of an
>>> aggregate that includes the host ?
>> Not quite sure what you're asking, but I *think* you are asking
>> whether I am proposing that the host aggregate's allocation ratio
>> that a compute node might be in would override any allocation ratio
>> that might be set on the compute node? I would say that no, the
>> idea would be that the compute node's allocation ratio would
>> override any host aggregate it might belong to.
> I'm not sure why you would want it that way round - aggregates lets
> me set/change the value of a number of hosts, and change the set of
> hosts that the values apply to.    That in general seems a much
> better model for operators that having to manage things on a per host
> basis.
> Why not keep the current model where an aggregate  setting overrides
> the "default" - that will now come from the host config rather that
> scheduler config ?

That's actually exactly what I proposed in the blueprint spec:



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