Mixed PVE8/PVE9 cluster - how stable is it?

[EvertM]

Hi all,

We have a cluster of 3 PVE nodes, all currently running PVE8. I would like to upgrade them all to PVE9 with minimal downtime. This would mean we'd be running a cluster with both PVE8 & PVE9 nodes for some days.
Will this work? Is it as stable as a cluster with only PVE8 or only PVE9 nodes? We don't use anything fancy like live migration or Ceph.

 

[apoyen]

Hello,

You can do it but I recommend you to not stay for a long time in this configuration. Limit modification in your cluster until you have completed your migration.

Avoid migration from a node with PVE9 to PVE8 nodes and always use web interface with the same version the node you are administrating.

If your are using HA I think it's better to disable it during your migration (for a few days).

 

[EvertM]

Hello,

You can do it but I recommend you to not stay for a long time in this configuration. Limit modification in your cluster until you have completed your migration.

Avoid migration from a node with PVE9 to PVE8 nodes and always use web interface with the same version the node you are administrating.

If your are using HA I think it's better to disable it during your migration (for a few days).

Thank you for the fast reply
We're not migrating between nodes, and we do not use HA at the moment.