[Engine-devel] Setting cluster CPU

[Sandro Bonazzola]

Il 09/12/2013 19:37, Michal Skrivanek ha scritto:
> 
> 
>> On 09 Dec 2013, at 18:58, Oved Ourfalli <ovedo at redhat.com> wrote:
>>
>>
>>
>> ----- Original Message -----
>>> From: "Michal Skrivanek" <michal.skrivanek at redhat.com>
>>> To: "Sandro Bonazzola" <sbonazzo at redhat.com>, "Roy Golan" <rgolan at redhat.com>
>>> Cc: "engine-devel" <engine-devel at ovirt.org>
>>> Sent: Monday, December 9, 2013 5:50:49 PM
>>> Subject: Re: [Engine-devel] Setting cluster CPU
>>>
>>>
>>>> On Dec 9, 2013, at 16:01 , Sandro Bonazzola <sbonazzo at redhat.com> wrote:
>>>>
>>>> Hi,
>>>> I'm trying to set the cluster CPU type while adding the first host to the
>>>> Default cluster.
>>>>
>>>> I know how to set the CPU type on a new cluster, since I'll do that in AIO
>>>> plugin.
>>>> But I'm not sure to understand how to set the CPU on an existing cluster.
>>>>
>>>> Should it be enough to specify cpu arg while adding the host to the
>>>> cluster?
>>>> (before adding an host, cpu is None on the cluster)
>>>> Because I'm trying to do that without success (obtaining a sandybridge
>>>> cluster while specifying westmere cpu).
>>>
>>> The CPU should be set from the first host if None. That is needed for the PPC
>>> support. Roy, we talked about it recently, where are we with this patch.
>>
>> We already support modifying the CPU level of an existing cluster. If changing it to a higher level then we just change it.
>> If changing it to a lower level, and there are running VMs on the cluster, then we warn the user that some VMs might not be migrate-able, as we added a scheduling filter to filter out hosts with improper CPU level.
>>
>> Unless I'm missing something, that covers the use-case, isn't it?
> 
> Not sure. I thought this is None to something, where it should work automatically without specifying anything. Just add an operational host

Well, here the issue is that while deploying hosted-engine VM, I'm on a SandyBridge host, with 1 VM running on it (the hosted engine VM).
That VM has been created with CPU model Westmere to be able to migrate it to other hosts Westmere compatible.
But the Default cluster is automatically set to SandyBridge when I add the host also if I specify Westmere as CPU family in Host parameter.
We may be able to set manually the CPU level later somehow, but since we've already asked the user about the CPU level I think we should avoid to ask
the user to change it again later. See Bug 1034821 - Hosted-setup asks for CPU type but it doesn't set cluster to that CPU Level


> 
>>
>>> Thanks,
>>> michal
>>>
>>>>
>>>> Michael, can you take a look at http://gerrit.ovirt.org/22129 and advise?
>>>>
>>>>
>>>> --
>>>> Sandro Bonazzola
>>>> Better technology. Faster innovation. Powered by community collaboration.
>>>> See how it works at redhat.com
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>>>
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-- 
Sandro Bonazzola
Better technology. Faster innovation. Powered by community collaboration.
See how it works at redhat.com