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UEFI

UEFI multi disc

Probably the best method is to use md raid, where content of disc is really mirrored (the same MBR, EFI partitions content). But try to do it without mdadm.

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