Currently running 4 node Promox cluster 5.4-15 with Ceph and trying to upgrade to Proxmox 6 and then hopefully Proxmox 7.
I have followed all the instructions documented on your site including https://pve.proxmox.com/wiki/Upgrade_from_5.x_to_6.0#Cluster:_always_upgrade_to_Corosync_3_first
The...