[pve-devel] Live migration should check for host compatibility?

[Daniel Hunsaker]

True, host *is* really only useful in single-node clusters, or homogenous
clusters at worst.  It's not intended for production use.  I have found it
increases performance quite a bit when running Windows 7 in a VM, though.
(A highly nonstandard setup for a highly unusual use case.  Not recommended
for general use.)

On Sat, Mar 21, 2015, 02:26 Alexandre DERUMIER <aderumier at odiso.com> wrote:

> Hi,
> for proxmox 4.0, we have added a qemu enforce option, which check if cpu
> flags exist on host machine when vm is starting.
>
> Of course, this works only if you choose a specific cpu model.
>
> (In my opinion, "host" should never be used. Only speficic models are safe
> and well tested)
>
>
>
> ----- Mail original -----
> De: "Waschbüsch IT-Services GmbH" <service at waschbuesch.it>
> À: "pve-devel" <pve-devel at pve.proxmox.com>
> Envoyé: Samedi 21 Mars 2015 07:03:06
> Objet: [pve-devel] Live migration should check for host compatibility?
>
> Hi all,
>
> Martin has kindly redirected me to the list as the appropriate place to
> ask / discuss this:
>
> I noticed that, even though a kvm guest is set to CPU type 'host', the
> live migration feature does not check for compatibility with the
> destination host.
> E.g. Moving from a Opteron 6366 to an Intel Xeon E5420 is going to cause
> the migrated VM to choke and die due to lots of CPU features no longer
> being there.
>
> That in itself is not surprising, but my suggestion would be to at least
> have a warning popup when choosing to migrate a kvm which is set to CPU
> type 'host'?
>
> Best,
>
> Martin
>
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