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I would look into setting up a proxmox cluster ~~with high availability~~ on them and from there you can look into fun projects that you can run as proxmox vms or lxcs.
https://www.xda-developers.com/proxmox-cluster-guide/
https://pve.proxmox.com/wiki/High_Availability
edit: HA seems to require a shared disk, such as a SAN or NAS.
You should be able to do HA with ceph, I think. You can do almost-HA with zfs mirrors, where instead of instant failover you only lose data up to the last mirror sync (a few minutes max).
Ceph is great, we run critical infra at work on proxmox with ceph. Very reliable in my experience. It was definitely helpful for me to have ceph experience from my home cluster when starting there.
Ah right, that rings a bell. Proxmox and Ceph sounds like a perfect experiment for OPs hardware. :)
https://pve.proxmox.com/pve-docs/chapter-pveceph.html
Eh... Maybe for learning.
Although they technically support vt-d, performance on 13-year-old machines will be pretty abysmal by today's standards.
They are not too terrible really. 3rd gen i7 is the Ivy Bridge generation, so 22 nm. For many homelab server tasks the CPUs would be just fine. Power efficiency is of course worse than modern CPUs, but way better than the previous 32 nm Sandybridge generation. I had such a system with integrated graphics and one SSD and that drew 15 W at idle at the wall.
Yeah, I focused on the I’m just looking for some fun experiments, projects part.
I wouldn't use the machines for anything other than experimenting for fun, they're power hungry too if counting per performance.
The at load efficency isn't always the most important metric, depending on what you are using the machines for. If they are mostly idle, efficiency isn't too bad. Many server tasks don't load the CPU to the fullest anyway.
That's true, if there's no load then the difference isn't much money.
I'm running a NAS, some game servers, a forgejo instance and a jellyfin server and more on my machine so it's never truly idle and I forgot to think about that metric.