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grub2

Reinstall grub2

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On Software RAID

Prepare chroot

mount /dev/md2 /mnt
mount /dev/md1 /mnt/boot
mount -t dev -o bind /dev /mnt/dev
mount -t proc -o bind /proc /mnt/proc
mount -t sys -o bind /sys /mnt/sys
chroot /mnt

Install grub2

grub2-install /dev/sda

Check if Grub was written in MBR

dd bs=512 count=1 if=/dev/sda 2>/dev/null | strings|grep GRUB