How do I change the boot loader to boot from a RAID1 pair?

opensuse 11.4 or 12.3

Let’s say I have created and formatted a RAID1 pair with 3 partitions (swap, /, /home), and copied the data from the old system disk to the RAID.

How do I indicate that the system should boot from the RAID?

Does GRUB point to one of the physical disks /dev/sdaX, or to the RAID device, /dev/mdX? Should it use UUID or Device-by-id?