How to install Snow Leopard on a 2009 Mac Pro which has Mountain Lion?

The 2009 Mac Pro that I just bought has Mountain Lion. For many reasons, I do not want to have Mountain Lion on my machine. I have been using Snow Leopard for years and I like it fine. I have my Snow Leopard install DVDs. I cannot get this machine to accept Snow Leopard, which must be just another undesirable aspect of Mountain Lion, bacause this machine must have shipped with some variant of Leopard/ Snow Leopard to begin with. Here's what happens when I put the Snow Leopard Install DVD in the Superdrive:
1) First, I held down the "C" key at startup to start from a disc. It showed me a window which said "Mac OS X can't be installed on this computer".
2) Then I started it with Mountain Lion and then put in the Snow Leopard DVD. Got a window which said "The disc you inserted was not readable by this computer". It also had 3 buttons to choose from: "Initialize", "Ignore" and "Eject". So I clicked on "Initialize" and Disc Utility opened on the First Aid page. I assume I'm supposed to erase the startup disc, but I thought maybe I should ask the experts here before I do that.
This machine has two 2TB HDDs that the previous owner has configured as a level 1 RAID. If I am to erase the startup disc do I erase both drives of the RAID set? If I'm not supposed to erase the startup drive, what do I need to do to get back to Snow Leopard? Thanks and thanks again!

The built-in checks will keep you from clobbering 10.8 Mountain Lion by Installing Snow Leopard over it (literally, 10.6 Snow Leopard Installer will see a later version in place, and knows it cannot install over a later version). So it says "Mac OS X cannot be installed on this computer..." and leaves off "... "in its current state."
You will need to Install on a 10.6 Snow Leopard-erased drive. Mac OS X Erase function proceeds to install a Partition scheme and a default Volume after erasing, because a truly blank drive is useless for most Users.
When you boot to the Installer DVD, you are running off the DVD, so all Hard Drives are available to be erased if that is your choice. All data on them will be discarded. If you erase one drive in a mirrored RAID set, normally the other drive would survive and the set would be degraded. But a new version of RAID was introduced right AFTER 10.6, and it is likely that 10.6 cannot read that RAID at all under any circumstances.

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