What CPU architecture to choose?

[rogierl]

Hey! Happy Proxmox user here (homelab). I do have a questin though: I'm running home assistant in a VM on Proxmox. I imported this using this helper script. Now I noticed that the helper script choses "HOST" as the architecture. Now I'm a bit concerned about the portability.

Therefore this question: what happens when I restore a VM backup on a different machine? F.e. a 7 year old computer runnign proxmox? Will I run into issues then? And what are the best practices here?

 

[bbgeek17]

what happens when I restore a VM backup on a different machine?

It should start.

7 year old computer runnign proxmox

Likely will be ok, as much as it can be on 7yo pc

Will I run into issues then?

no, you should not run into issues. But if you were to use some other ARCH than host, you could. The 7yo PC will not support CPU commands introduced in younger generations.

And what are the best practices here?

Use "host"

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Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[rogierl]

Thanks, @bbgeek17 .

 

[louie1961]

Host is always the safest bet for architecture type, as that just mean it is using what is native on the machine, and not trying to emulate some other CPU type.

 

[wtosta]

"Host" processor type passes all VE CPU features and capabilities to guest VM's CPU. So choose this one.

 

[bbgeek17]

There are few times when using an older or common architecture is needed:
- moving between Intel and AMD (never guaranteed to be seamless)
- moving VM from newer Hypervisor CPU to Older. Absence of some flags/commands can cause OS crash
- using specialized Os/App that relies on Architecture specific functionality - absence or "appearance" of new capabilities can cause a crash

In most cases "host" is the safe choice.

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[rogierl]

Thanks all, for your replies.