You cannot mix AMD and Intel processors in a cluster. So if you have an AMD based host, then you need to add it to AMD cluster only

AMD EPYC support is available from 4.3 cluster level, so it should definitely be available in the latest 4.6 CL

On Wed, Feb 2, 2022 at 10:24 AM Richard W.M. Jones <rjones@redhat.com> wrote:
On Tue, Feb 01, 2022 at 08:45:51PM +0100, Martin Perina wrote:
>
>
> On Tue, Feb 1, 2022 at 8:27 PM Richard W.M. Jones <rjones@redhat.com> wrote:
>
>
>     2022-02-01 19:05:01,952Z ERROR
>     [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector]
>     (EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-19)
>     [330886aa] EVENT_ID: CPU_TYPE_UNSUPPORTED_IN_THIS_CLUSTER_VERSION(156),
>     Host ovirt4410-host moved to Non-Operational state as host CPU type is not
>     supported in this cluster compatibility version or is not supported at all
>
>     The host is a nested VM running on old hardware.  I don't care that
>     it's not supported - this is just for testing copying and it'll
>     literally never even need to run a VM.
>
>     Is there a way to ignore this and continue?
>
>
> Hi,
>
> You need to create a custom DC and a cluster with lower
> compatibility level to be able to use older CPUs.
>
> You can take a look at supported CPUs for each cluster level using
> ServerCPUList config option:
>
> https://github.com/oVirt/ovirt-engine/blob/master/packaging/dbscripts/upgrade/pre_upgrade/0000_config.sql#L1125

OK that operation is underway.  I selected CPU type "Nehalem", that
being an ancient Intel CPU.  The hardware is AMD and there were no AMD
options.  I'll see if it installs anyway.

> What is your hypervisor CPU?

The oVirt host is a VM with an interesting choice of guest CPU now I
look at it:

processor : 0
vendor_id : AuthenticAMD
cpu family  : 23
model         : 49
model name    : AMD EPYC-Rome Processor
stepping      : 0
microcode     : 0x1000065
cpu MHz         : 3792.872
cache size      : 512 KB
physical id     : 0
siblings : 1
core id    : 0
cpu cores  : 1
apicid       : 0
initial apicid : 0
fpu            : yes
fpu_exception  : yes
cpuid level    : 13
wp             : yes
flags            : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good nopl cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw topoext perfctr_core ssbd ibpb stibp vmmcall fsgsbase tsc_adjust bmi1 avx2 smep bmi2 rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves clzero xsaveerptr wbnoinvd arat umip rdpid arch_capabilities
bugs               : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
bogomips           : 7585.74
TLB size           : 1024 4K pages
clflush size       : 64
cache_alignment    : 64
address sizes      : 40 bits physical, 48 bits virtual
power management:

--- and hypervisor CPU:

processor      : 23
vendor_id      : AuthenticAMD
cpu family     : 23
model            : 113
model name       : AMD Ryzen 9 3900X 12-Core Processor
stepping         : 0
microcode        : 0x8701013
cpu MHz            : 2200.000
cache size         : 512 KB
physical id        : 0
siblings : 24
core id    : 14
cpu cores  : 12
apicid       : 29
initial apicid : 29
fpu            : yes
fpu_exception  : yes
cpuid level    : 16
wp             : yes
flags            : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif v_spec_ctrl umip rdpid overflow_recov succor smca sme sev sev_es
bugs               : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass
bogomips           : 7585.86
TLB size           : 3072 4K pages
clflush size       : 64
cache_alignment    : 64
address sizes      : 43 bits physical, 48 bits virtual
power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14]

Rich.

> Regards,
> Martin
>
>
>
>     Rich.
>
>     --
>     Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/
>     ~rjones
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>
>
>
> --
> Martin Perina
> Manager, Software Engineering
> Red Hat Czech s.r.o.

--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
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--
Martin Perina
Manager, Software Engineering
Red Hat Czech s.r.o.