Dell Power edge PE860 sata

Hi I think I have seen a number of users with the PE860, would someone be kind enough to pass on the tips regarding getting the ROS onto the HDD (preferably without removing the drives)

My machine has a quad 2.3Ghz Xeon core with 2 x Barracuda 1500GB drives !!.

The machine also uses the external UCL51 sata controller card…(not the onboard controller)

I was hoping to do caching, and run an asterisk server on the machine.

Is Omega reading, he has a few?