Adding Proxmox VE 9 nodes to an existing PVE 8.3.2 cluster

[punkn123]

Hello Guys,

I currently have a Proxmox VE cluster running version 8.3.2 with 4 nodes. Recently, I deployed 2 new nodes running Proxmox VE 9 and would like to add them to the existing 8.3.2 cluster.

Before proceeding, I’d like to confirm:

- Is it possible to join Proxmox VE 9 nodes to a PVE 8.3.2 cluster directly?
- If not, what is the recommended upgrade or migration path to integrate these nodes without downtime or data inconsistency?

Appreciate any guidance or best practices regarding mixed-version clusters or upgrade sequencing.

Regards,
Punkn

 

[SteveITS]

They should all be on the same version in the end. IIRC it’s recommended or needed to be on the latest 8.x to upgrade to 9 so I’d just upgrade the older nodes to 8.4 first.