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Multiple nova-computers per host?

 

 

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mikal at stillhq

Jul 29, 2013, 3:02 PM

Post #1 of 2 (39 views)
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Multiple nova-computers per host?

Hi.

I've just read a libvirt code review which implies to me that people
are deploying multiple nova-compute processes per physical compute
host to work around scaling concerns.

I have some concern that this might be bad idea, because I can think
of a variety of race conditions you'd experience if you did that. It
_might_ be possible to work around some of these race conditions by
playing with periodic task configuration, but it wouldn't help with
some others.

Is anyone here deploying in this way?

Thanks,
Michael

--
Rackspace Australia

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azpekt at gmail

Aug 6, 2013, 2:38 AM

Post #2 of 2 (20 views)
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Re: Multiple nova-computers per host? [In reply to]

On 07/30, Michael Still wrote:
> Hi.
>
> I've just read a libvirt code review which implies to me that people
> are deploying multiple nova-compute processes per physical compute
> host to work around scaling concerns.
>
> I have some concern that this might be bad idea, because I can think
> of a variety of race conditions you'd experience if you did that. It
> _might_ be possible to work around some of these race conditions by
> playing with periodic task configuration, but it wouldn't help with
> some others.
>
> Is anyone here deploying in this way?
>
> Thanks,
> Michael


Hi Michael,

Frankly saying, I`m not deploying my copute nodes in that fashion; but can you pls elaborate, what you mean by scaling issues? I thought, that having one nova-compute process on host is sufficient, and it will scale up to all available h/w resources - or am I missing somehthing here?

Regards,
Nick

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