UEFI

How to handle redundant boot from multiple discs ?

Added 2 more EFI partitions (3 discs setup):

# Change partition 1 type to EFI on each disc:
 
sgdisk -t 1:EF00 -c1:efi $DISK
 
mkfs.fat -F 32 $DISK-PART
blkid $DISK-PART
mkdir /boot/efi0
 
mkdir /boot/efi1

Add new partitions to fstab:

/etc/fstab

UUID=D12D-CBBD  /boot/efi0       vfat    umask=0077      0       1
UUID=D150-1EE7  /boot/efi1       vfat    umask=0077      0       1

grub_update.sh

#!/bin/bash -eu
 
DEVICES=( \
"/dev/disk/by-id/nvme-Samsung_SSD_970_EVO_Plus_500GB_Sxxxxxxxxxxxxxx,efi1" \
"/dev/disk/by-id/nvme-Samsung_SSD_970_EVO_Plus_500GB_Sxxxxxxxxxxxxxx,efi0" \
"/dev/disk/by-id/nvme-ADATA_LEGEND_710_xxxxxxxxxxxx,efi" \
)
 
for DEVLINE in "${DEVICES[@]}"; do
 
read -r DEV BOOTDIR <<< "$(echo "${DEVLINE}" | tr ',' ' ')"
grub-install --target=x86_64-efi --efi-directory=/boot/"${BOOTDIR}" "${DEV}"
 
done