# mdadm --examine --scan
ARRAY /dev/md0 UUID=36bc740b:10f94c71:6c05f080:a80a9cd6
ARRAY /dev/md1 UUID=fca16958:3da5dd11:6c05f080:a80a9cd6
ARRAY /dev/md2 UUID=c402ff55:e93e2a8e:6c05f080:a80a9cd6


# grub-probe --device-map=/boot/grub/device.map --target=fs -v /boot/grub
grub-probe: info: changing current directory to /dev.
grub-probe: info: opening md0.
grub-probe: error: no such disk.