External: Think before clicking

Hi,

I'd appreciate any feedback about the issue we are facing, either with
advices on how to troubleshoot more precisely the problem or wih a
possible solution if the problem has aleady been seen...

Thank you in advance. Best regards,

Michel

Le 12/05/2024 à 22:28, Michel Jouvin a écrit :
> Hi,
>
> In a Yoga cloud, I upgraded all the core services and 1 compute to
> Antelope (directly from Yoga, using a SLURP upgrade). This cloud has 4
> compute servers, all using the same HW (Dell FX2/FC630 with Broadwell
> CPUs).
>
> After the upgrade, any attempt to live migrate a VM from a Yoga
> compute to the Antelope compute fails with the following error in
> destination/Antelope nova-compute.log:
>
>     nova.exception.MigrationPreCheckError: Migration pre-check error:
> Unacceptable CPU info: CPU doesn't have compatibility.
>
> This looks weird. I don't see anything in the release notes related to
> this problem, except a mention that the API used to do the comparison
> has changed ("This change replaces the usage of older API,
> compareCPU(), with the new one, compareHypervisorCPU().").
>
> "virsh capabilities" reports the same thing for a Yoga and an Antelope
> compute, except the addition of a feature 'flush-l1d' in Antelope and
> the addition of 2 new attributes in the '<cpu>' section:
>
>       <signature family='6' model='79' stepping='1'/>
>       <maxphysaddr mode='emulate' bits='46'/>
>
> I tend to think that additions are not a problem in general and so it
> doesn't seem to explain the problem I'm facing. Anybody with a similar
> experience? It seems to me a different problem that the one that has
> been faced in the past (before Nova 20 if I'm right) and described in
> several posts, with CPU model improperly detected (in particular
> Broadwell vs. Icelake).
>
> Thanks in advance for any hint/suggestion. Best regards,
>
> Michel
>