ok i just found the solution,

on the grub.cfg

the set root line must be set root=md/0 on not set root=md0...

Hello, i try to install arch linux on zfs + /boot on mdadm but i have an issue. At boot i have this error: Error: device 'ZFS=zroot/' not found here is how i install my system: nano /etc/pacman.conf -> [demz-repo-archiso] Server = http://demizerone.com/$repo/$arch pacman-key -r 0EE7A126 pacman-key ...