Swap from legacy boot to UEFI - Proxmox ZFS

proxmox.md

1. Get a proxmox ISO mounted

2. boot to bios, switch to uefi, boot to ISO

3. head to Install Proxmox (Debug Mode) under advanced options

4. press ctrl-d to launch a terminal

5. mount zfs, then chroot into it

zpool import -f -R /mnt rpool
mount -o rbind /proc /mnt/proc
mount -o rbind /sys /mnt/sys
mount -o rbind /dev /mnt/dev
mount -o rbind /run /mnt/run
chroot /mnt /bin/bash

6. reformat second partition on every drive to uefi boot

proxmox-boot-tool format /dev/sda2
proxmox-boot-tool init /dev/sda2

...

exit

7. boot back to bios, change boot order back to the drives