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From Andrija Panic <andrija.pa...@gmail.com>
Subject Re: CPU live migration question
Date Tue, 19 Feb 2019 11:59:10 GMT
Ugo,

as long as the CPU flags are same or newer than the existing hosts in
cluster, it's 100% safe operation in regards to live migrations.

But as Piotr said, if you are using some level of emulation of CPU model
(versus hos-passthrough), then you might be good even with slighly older
CPU on this new hosts that you want to add to a cluster.

Do some reading around libvirt CPU model and simply just add one host and
test live migration - as simple as that.

Kind regards,

Andrija

On Tue, 19 Feb 2019 at 12:39, Piotr Pisz <piotr@piszki.pl> wrote:

> Hi Ugo,
>
> [root@cstack-1 ~]# cat /etc/cloudstack/agent/agent.properties  |grep passt
> guest.cpu.mode=host-passthrough
>
> The CPU model determines everything, if you have a passthrough it will be
> difficult or not possible.
> But if you have emulated it is no problem (eg you set up SandyBridge
> everywhere).
>
> Regards,
> Piotr
>
>
> -----Original Message-----
> From: Ugo Vasi <ugo.vasi@procne.it.INVALID>
> Sent: Tuesday, February 19, 2019 12:27 PM
> To: users@cloudstack.apache.org
> Subject: CPU live migration question
>
> Hi all,
> I would like to know if it is possible to add to an existing cluster a host
> that has the cpu different from that of the pre-existing hosts or which
> features must be the same.
>
> I have read around that there may be problems at the libvirt level but it
> is
> not clear to me which parameters must match.
>
> Thanks
> --
>
> *Ugo Vasi* / System Administrator
> ugo.vasi@procne.it <mailto:ugo.vasi@procne.it>
>
>
>
>
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-- 

Andrija Panić

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