I want to upgrade my Proxmox cluster from 2.2 to 4. I think I have this well thought, but there's one thing I am not sure of.
Currently, my installation runs on LVM A. I have added few new disks and created LVM B. I would like to install the new system on LVM B, migrate the virtual servers there and only after I make sure everything works [it's kind of a big leap] I will want to salvage the old drives.
After installing the new system, I understand that I will be editing the /etc/grub.d/10_linux
file on the old system in order to be able to boot the new installation.
Once everything works, how do I move the config to the new installation and ensure that it works after I remove the old drives?