Proxmox 5.2/5.3 UEFI grub install

uefi_grub_setup_pve.sh

#!/bin/bash

BOOTDEV="/dev/sda"

# PVE 5.3
EFIDEV="/dev/sda2"

# PVE 5.2
# EFIDEV="/dev/sda9"

# == ( 5.2/5.3 FIX UEFI BOOT ) ==========================

## in UEFI mode: install zfs root, shut down completely, cold rescue boot from Proxmox ___5.2___ install media
## 5.3 install media will not rescue boot successfully
## cold boot was important on my machine, warm boot would just hang trying to boot the rescue media

# Notes:
#  find 512MB UEFI partition, for me it was /dev/sda2 (sda1 was BIOS boot stuff) on 5.3
#  and /dev/sda9 (solaris reserved) on 5.2
#   lsblk -f
#   fdisk -l /dev/sda  (YOUR BOOT DEVICE HERE)
#
#  use your EFI partition below


mkdir -p /boot/efi
mkfs.vfat -F32 $EFIDEV
echo PARTUUID=$(blkid -s PARTUUID -o value $EFIDEV) /boot/efi vfat noatime,nofail,x-systemd.device-timeout=1 0 1 >> /etc/fstab
mount /boot/efi
grub-probe -d $EFIDEV
update-grub
grub-install -d /usr/lib/grub/x86_64-efi $BOOTDEV

Hi there is this install when I have to install the grub on the new disks?
When I need to replace?

You shouldn't need to do this anymore, PVE 6.x handles UEFI boot out of the box. If you're using PVE 5.x you only need to do this when you setup a boot disk (or replace the boot drive.) This method doesn't setup drives properly for mirrors either, you should use PVE 6.x if you need actual redundancy.

thanks for the reply, not sure if you had a case to replace a disk on proxmox 6.x with uefi? Because i tried the follow steps

sgdisk /dev/disk/by-id/scsi-35000c5003a81d367 -R /dev/disk/by-id/scsi-35000c5003a7dab73
sgdisk -G /dev/disk/by-id/scsi-35000c5003a7dab73
zpool replace -f rpool 8707294139048458014  /dev/disk/by-id/scsi-35000c5003a7dab73-part3

but install the boot on that drive i got this error

root@prometheus:~# pve-efiboot-tool init /dev/sdb2
Re-executing '/usr/sbin/pve-efiboot-tool' in new private mount namespace..
UUID="" SIZE="536870912" FSTYPE="" PARTTYPE="c12a7328-f81f-11d2-ba4b-00a0c93ec93b" PKNAME="sdb" MOUNTPOINT=""
E: '/dev/sdb2' has wrong filesystem (!= vfat).
root@prometheus:~# pve-efiboot-tool init /dev/sdb1
Re-executing '/usr/sbin/pve-efiboot-tool' in new private mount namespace..
UUID="" SIZE="1031168" FSTYPE="" PARTTYPE="21686148-6449-6e6f-744e-656564454649" PKNAME="sdb" MOUNTPOINT=""
E: '/dev/sdb1' is too small (<256M).
root@prometheus:~# pve-efiboot-tool init /dev/sdb3
Re-executing '/usr/sbin/pve-efiboot-tool' in new private mount namespace..
UUID="" SIZE="299462063616" FSTYPE="" PARTTYPE="6a898cc3-1dd2-11b2-99a6-080020736631" PKNAME="sdb" MOUNTPOINT=""
E: '/dev/sdb3' has wrong partition type (!= c12a7328-f81f-11d2-ba4b-00a0c93ec93b).