> ... being able to do software patches of the underlying system without service outages is really desirable.

Yeah, that's what I was looking at Proxmox (8.x) for recently as well, but it never made it through basic qualification testing. VM migration's would randomly hang forever about 25% of the time. Definitely not a case of bad network interconnect either. :(

I'm using Ryzen 5000 series cpus on all the test gear though, and recently saw a mention that it may have been a known problem that's fixed. But not super keen on wasting more time.

What sort of cpus are your hosts using, and are you using your VMs with Ceph as their storage? :)