Setting active device while installing for RAID1

[Messyhair42]

I finally have all the hardware I needed and I've got a 12.04 alternate installation disk ready. I've got two identical drives and I'm trying to recreate something like my previous partitioning scheme: separate partitions for /, /usr, /var, /tmp, swap and /home. In the partitioning screen I set this up under one drive and went to "configure software RAID" where it tells me to choose two active devices. I see the partitions for one drive, in my case SCSI3 or sdc* while the second drive doesn't appear at all. under the partitioning screen it appeared as SCSI4 or sdd*. How do I set the active devices for a RAID1 setup between these two drive with my partitioning scheme?

[Messyhair42]

Work and distractions have prevented me from trying again. but I'm bumping because my original question is still unresolved. what do I select as my active device in a RAID1 when I spread different directories across multiple partitions; read my first post for full detials.