grub-install --force --modules=mdraid /dev/sda


/usr/sbin/grub-probe: error: no mapping exists for `md1'.
/usr/sbin/grub-probe: error: no mapping exists for `md1'.
/usr/sbin/grub-probe: error: no mapping exists for `md1'.
You attempted a cross-disk install, but the filesystem containing /boot/grub does not support UUIDs.