Snow Leopard Installer Not Seeing RAID 5 Array

I currently have a Mac Pro with Leopard installed on an internal RAID 5 array. When I run the 10.6 installer to upgrade the only install disk choices I see are two external USB drives. The RAID 5 array is not in the list of possible install drives. Any idea what might be wrong here?

The fact it asked if you want to create RAID5 = Apple Pro RAID card was BTO and is present. Open it up, Apple's RAID card is there likely. And uses iPass so that your drive sleds connect to the controller rather than the motherboard Intel AHCI.
http://support.apple.com/kb/HT1346
http://www.apple.com/support/macpro/
Photo: http://support.apple.com/kb/HT3514
RAID5 capacity - http://support.apple.com/kb/TA24883
RAID5 discussion from before (myself, mbean, poster)
http://discussions.apple.com/thread.jspa?messageID=8446960
MaxConnect SAS/SATA Link for Mac Pro (iPass)
http://www.maxupgrades.com/istore/index.cfm?fuseaction=category.display&category _id=332
Apple Mac Pro RAID Card is an SAS controller
http://blogs.computerworld.com/applemac_pro_raid_card_is_an_sascontroller

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