Adding Proxmox 8.4.13 Node to Existing 8.3.2 Cluster - Compatibility & Live Migration?

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Sonu21

New Member
Sep 15, 2025
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Hey everyone,

I'm hoping to get some advice on a cluster expansion I'm working on. My current setup is a 3-node cluster, and all the nodes are running on Proxmox VE 8.3.2. The pve-qemu-kvm package on these nodes is 9.2.0-2.

I've just finished a fresh installation on a new server that I want to add to the cluster. This new node is running Proxmox VE 8.4.13, and its pve-qemu-kvm version is 9.2.0-7.

I know that Proxmox is generally flexible with minor version differences, but I'm a bit hesitant to just jump in without asking. I have a few key questions:

  1. Will there be any compatibility issues when joining the 8.4.13 node with the older 8.3.2 cluster?
  2. Will live migration work seamlessly? I'm a little concerned about moving VMs from my older 8.3.2 nodes to the newer 8.4.13 one, and especially about migrating them back if I need to.
 
Migration to a higher version should work fine but back to a lower version not always. Since they are both 9.2.0, I would be surprised if it did not work. Why not update your other nodes to the latest 8.4 as well (which should be low risk) and by-pass those questions completely?
 
leesteken said:
Migration to a higher version should work fine but back to a lower version not always. Since they are both 9.2.0, I would be surprised if it did not work. Why not update your other nodes to the latest 8.4 as well (which should be low risk) and by-pass those questions completely?
Click to expand...

I have that option, but currently I want to avoid any downtime of the vms on the existing cluster nodes because of proxmox upgradation. so just wanted to know if everything goes smoothly with these differentiated versions.
 
If I remember correctly, the official answer is: it should work, but it’s not guaranteed - nobody explicitly tests upgrades between every possible combination of minor in-family releases.

That said, the Proxmox team takes great care to avoid breaking existing environments. If a potential breakage exists, you’ll usually see a warning about it in the release notes.

If you want certainty, the safest approach is to spin up a test (nested) PVE cluster and run through the upgrade process there.

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