Yes, I understand this situation. I'm now on Proxmox 8, but I could revert to 7 and using my current ZFS pool, because it has not been upgraded yet. But eventually I would need go to 9, because security updates only will last untill this summer...
Yes, as a backup-plan that's a good idea. But for now the question keeps unanswered:
Am I good to go in this situation?
As I can see the proxmox-boot is active, thus in a normal situation zpool upgrade should be able to work, without breaking...
I have three Proxmox servers upgraded from 7.4 to 8.4.
Two have Legacy BIOS boot mode and one EFI boot mode.
I think the proxmox-boot-tool already initialized the disks, because it is giving me:
Legacy Server 1:
Re-executing...