Hi Ramon,

Could you please share the following details?

what is the cluster's countThreadsAsCores setting (Edit Cluster dialog -> Optimization tab)
what is the VM's CPU topology for both VMs - running and failed (Edit VM -> System tab -> Advanced parameters)
a screenshot of the host's CPU topology (Host detail -> Host devices tab -> View CPU Pinning button)
what is in the engine.log (you need to enable DEBUG messages to see details why the host was filtered out)

Thank you,

Lucia

On Tue, Jun 28, 2022 at 11:35 PM Arik Hadas <ahadas@redhat.com> wrote:

On Tue, Jun 28, 2022 at 8:29 PM Ramon Clematide <ramon@clematide.ch> wrote:
>
> Hi
>
> I just upgraded my oVirt installation from 4.4.10 to 4.5.1.2. The upgrade went through without any errors and most things seem to work but i have one critical problem now. Somehow it does not evaluate the correct number of CPU available on the hypervisor and blocks the start of a VM (except for the engine). The problem I only have on the hypervisor which has the engine deployed. I have three hypervisors, but only one has the engine installed. This hypervisor is also in a seperate cluster.
>
> After the upgrade, on the hypervisor which has the engine installed, I can't start a VM via the oVirt Manager. I can start the engine via "hosted-engine --vm-start" but if I try to start any other VM it fails with this Error:
>
> https://imgur.com/7lbGb8v
>
> --------------------------------------------------------------------------------------------------------
> Operation Canceled
> Error while executing action:
>
> Razor:
> Cannot run VM. There is no host that satisfies current scheduling constraints. See below for details:
> The host venge did not satisfy internal filter CPU because it has an insufficient amount of CPU cores to run the VM.
> --------------------------------------------------------------------------------------------------------
>
> I did not change any specs for the VM and even if I reduce the VM to only use 1 core it fails with the error above.
>
> This are the specs of my hypervisor, it has 2 cores with 2 threads:
>
> https://imgur.com/rbJnqP3
>
> This is the ovirt version installed
>
> https://imgur.com/4LLTVFN
>
> Does someone know how to fix this?

Sounds like https://bugzilla.redhat.com/2095259 but since the fix for
that one is included in the version you use, I assume that's a
different issue
Lucia, can you please follow up on this?

>
> Regards
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