Cluster issue with versions 8 and 9

J

Juancho81

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Oct 16, 2025
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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.
 
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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
 
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