Le 05/12/2020 à 13:47, Nicolas Kovacs a écrit : > # mdadm --create /dev/md/EFI --level=1 --raid-devices=2 \ > --metadata=1.2 /dev/sda1 /dev/sdb1 I'll answer that myself, since I just found the solution to my problem after searching for hours. Turns out the EFI partition needs to be created with --metadata=1.0 instead of --metadata=1.0: # mdadm --create /dev/md/EFI --level=1 --raid-devices=2 \ --metadata=1.0 /dev/sda1 /dev/sdb1 Boots fine now. Cheers, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info at microlinux.fr Tél. : 04 66 63 10 32 Mob. : 06 51 80 12 12