Mix CPU generations?

[MoreDakka]

I've been trying to find a definitive answer on this, I'm guessing I'm not doing the right search.

With proxmox are we able to mix different CPU types and CPU generations? The best example I can come up with is:

Dell PE2950
Dell r710
Dell r515
Dell r730

Could I make a cluster using an example setup like that? What would be the down side to it if it does work?

Thanks!

 

[udo]

Hi,
yes this work, but you can have issues with live-migration due the different cpu types.
But mostly it's works with the kvm64 cpu for the VM too.

Udo

 

[MoreDakka]

If we do non-live migrations between odd hosts, that won't be a problem? So dropping in a new host would mean adding to the cluster, migrating the removing the old host(s)?
Would HA have problems with the different host CPUs or would you just create a new group of new servers and once a VM/CT is migrated into that server group then HA would keep them in that group right?

 

[spirit]

ha will stop/start the vms, so they will be able to restart without any problem, you just need to use default vm cpu model = kvm64.
Migration will maybe works. (not sure about the 2950)

(Personnaly, I'll avoid to reuse a dell 2950, they are more than 14years old now, and maybe it could impact corosync performance, as they are a really slower than others)

 

[MoreDakka]

Spirit,
Yes definitely. I have some 2950s as test machines but not much left of those in production. Mostly r710s and I would like to retire those soon too as the CPUs are starting to get on the old side (where 2950s are on the really old side).
Thanks for the info!