You can also boot a Linux Live CD (or system rescue CD) or knoppix and fdisk -l - make sure you have a bootable partition and its the same one on each of the raid-1 disk members.
Justin.
Now when I go with rescue CD and do fdisk -l it's showing me RAIDs like a single drive, ie /dev/sda for RAID1 and /dev/sdb for RAID5. This is my first time experience with RAID but my impression is that as soon as you gathered disks under RAIDs they would show up as single units in /dev.