[PVE-User] Cluster mixed hardware behavior (CPUs)

[Thomas Lamprecht]

Am 4/26/19 um 2:05 PM schrieb Craig Jones:
> Hello,
> 
> To my understanding, in the vSphere world, a cluster with hosts of mixed 
> CPU frequencies and generations (let's assume consistent manufacturer) 
> will run at the lowest common denominator. In other words, if you have 3 
> hosts each with CPU frequencies being 2.1 GHz, 2.3 GHz, and 2.5 GHz 
> respectively, the entire cluster will run at a 2.1 GHz level. Is this 
> the same in the Proxmox world or what would be the equivalent behavior 
> for a Proxmox cluster?
> 

No, Proxmox VE does not has the GHz logic VMWare products have.

You add cores to the VM, the VM can use that, if you want to reduce
total CPU usage you can set CPU limits, with this you could add 4 cores
to a VM but limit it to use maximal 200% (which could be all 4 cores at
50%, or 2 at 100%, ...)

see:
https://pve.proxmox.com/pve-docs/chapter-qm.html#qm_cpu

For this, and various other reasons, we recommend homogeneous nodes in
a cluster, while differences to a certain degree do not really matter,
having a very asymmetrical (e.g., a 10 year old quadcore and a new
48-core CPU) setup makes things not easier.

cheers,
Thomas

> Thanks,
> Craig
> 
> 
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