Snow Leopard install doesn't recognize system disk

I'm trying to upgrade a MacPro1,1 running Leopard 10.5.8 to Snow Leopard. The system has 3 hard drives, two striped RAID sets, each made with two physical drives and an external hard drive enclosure used for Time Machine.
When I run the SL installer, I agree to the license and get to the screen where I pick the hard drive to upgrade. Neither of the RAID sets is displayed, only the Time Machine disk.
Already tried repairing disk permissions with Disk Utility with no luck. Leopard boots and runs fine on this machine. What's going on?

I just re-ran the installer to look for the 'Show All Disk....' button. There is no such button in my installer.
The only actions available are to click on the displayed, Time Machine disk, which shows a message that the disk can't be used "because it doesn't use the GUID Partition Table scheme." If I have no disks selected, the "Customize..." button is active which brings up a dialog with no contents except for the text "0 bytes required for installation", a "Restore Defaults" button in the lower left and an "OK" button in the lower right. "Restore Defaults" does nothing and "OK" dismisses this dialog. Finally, I can click "Go Back" which just takes me to the initial screen.

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