Upgrading RH 7.2 to 9

[Thomas Smith <tom openadventures org>]

I've got several server running Redhat 7.2 with a mix of RAID1 and RAID5 
partitions. When I try to upgrade them to Redhat 9 the install utility 
tells me that it can't detect any valid installation devices.

If I select the option to manually tell it where to find the partition 
it shows only the hd* devices and none of the md* devices.

I'm trying to perform a network-based install as the servers don't have 
CD-ROMs--they all have four IDE hard drives. When I boot from the floppy 
it appears that the RAID modules load and that it detects all the RAID 
devices (md0, md1, and md2). I simply can't access them to do an upgrade 
install.

How can I accomplish this?