I have a 3 node cluster and one node updated from 6.4 to 7.0. For the Linbit controller and DRBD I use this repository: "deb http://packages.linbit.com/proxmox/ proxmox-7 drbd-9.0 ". I followed all the steps in https://pve.proxmox.com/wiki/Upgrade_from_6.x_to_7.0 and had no visible errors during...
