1. install OpenSUSE on first hard drive (sda1).
2. run fdisk on /dev/sda1 to make the exact partitions on /dev/sda1.
3. run the option "a" to make the first partition bootable on sda.
4. run dd if=/dev/sda1 of=/dev/sdb1 (same for 2,3,5,6 and 7)
5. modify grub.conf and fstab on sdb1 to boot
6. Install grub on the mbr of the second drive:
$ grub --batch <<EOF
> root (hd1,0)
> setup (hd1)
> quit
> EOF