Proxmox Backup Servers offline after upgrade from 3.1 to 3.2 (large drives)

On both my PBS servers this morning I’m getting the following. Both PBS server has more than 2 TB drives, which might be of relevant.

attempt to read or write outside of disk ‘hd0’ proxmox

Both servers are unbootable. So far the only information:

https://forum.proxmox.com/threads/servers-stuck-at-grub-rescue-attempt-to-read-or-write-outside-of-disk-hd0.116320/

Let’s try UEFI boot:

Rebooting doesn’t work because the machine isn’t started up and there is no qemu-guest-agent. So force stop. But since the disk is locked after attempting a reboot, it’s best to wait for that to time out.

Then start again, and it works!

Albeit one small warning:

WARN: no efidisk configured! Using temporary efivars disk.

For now we’ll ignore that warning.

More information:

https://forum.proxmox.com/threads/servers-stuck-at-grub-rescue-attempt-to-read-or-write-outside-of-disk-hd0.116320/

Refers to:

https://aaronlauterer.com/blog/2021/move-grub-and-boot-to-other-disk/

Lots of explanations:

https://forum.proxmox.com/threads/pve-v6-error-attempt-to-read-or-write-outside-of-disk-hd0-after-dist-upgrade.100693/

Possible disk size issues:

https://forum.proxmox.com/threads/attempt-to-read-or-write-outside-of-a-disk.87534/

Seems like disk corruption on this one:

https://forum.proxmox.com/threads/vm-cant-boot-attempt-to-read-or-write-outside-of-disk-hd0.71136/