Cluster behaviour when upgrading to 6.2

[carles89]

Hello,

We've a cluster of 4 servers running Proxmox VE 5.4, and we're upgrading them to 6.2 next week. The upgrading path will consist on moving out VMs from the node that's going to be upgraded. Since we're using local storage, it can be a time-consuming process.

Our concern is if, when all cluster is running on Corosync 3, and we start to upgrade nodes, the remaining nodes with 5.4 will continue operating as usual (backups, etc.). We'll not be migrating vms from 6.2 to 5.4, we just want to make sure everything will continue working, since the process may take more than 1 day.

Thanks in advance!

 

[Stefan_R]

Yes, the old nodes will continue running with corosync 3. It is not recommended, so I wouldn't leave it like that for too long, but in general 5.4 with corosync 3 provides the same functionality as 5.4 with older corosync.

You probably already did, but if not, check out our upgrade guide.

 

[carles89]

Hi Stefan_R,

Thanks for your answer.

You probably already did, but if not, check out our upgrade guide.

Yes I did, just wanted to make sure that when the guide says "Note: changes to any VM/CT or the cluster in general are not allowed for the duration of the upgrade!" is referring to Corosync upgrade process only, not all cluster.

Best regards,

Carles