Cluster issue with versions 8 and 9

J

Juancho81

New Member
Proxmox Subscriber
Oct 16, 2025
2
1
3
Hello,

I have a question. I have a cluster of 4 nodes with 8.4 and I am adding 2 more nodes, but I wanted to take advantage of this to switch to Proxmox 9. Is this possible? Or are there any restrictions or limitations?

Best regards
 
Hello,

I would upgrade the existing nodes first and then add the two new ones as it is not recommended to run different major versions of PVE for a prolonged timespan.
 
  • Like
Reactions: Johannes S
When I had a version 8 node and a version 9 node in my two node (with quorum site) the HA feature did not work. After I upgraded the version 8 node to version 9 HA worked perfectly again. So if you use HA you have to upgrade all nodes to version 9.
 
Hello,

Thanks for the suggestion. I was thinking of reinstalling the cluster, that is, adding the two new servers with pve9 to the cluster and moving the machines so that I could then update the four nodes of the cluster. I'm not sure if this is the right thing to do, because I have a SAN that is distributing LVM to the four-node cluster.

Best regards
 
  • Like
Reactions: UdoB
Juancho81 said:
I was thinking of reinstalling the cluster, that is, adding the two new servers with pve9 to the cluster and moving the machines so that I could then update the four nodes of the cluster.
Click to expand...
That's not "reinstalling", that is expanding an existing cluster and then upgrading some old nodes. For me this looks like the way I would go.

For the upgrade read https://pve.proxmox.com/wiki/Upgrade_from_8_to_9 in beforehand and consult "pve8to9 --full". There are "hickups" like changes in NIC naming...
 
You must log in or register to reply here.
Top Bottom