Dell power edge T620 RAID configuration and OS installation

Hi,

We have DELL T620 poweredge server my client want to configure it RAID and istall new OS 2008 on it But server DVD has been lost.I told him i an alternative way to configure RAID without Server DVD.

But my client insisting me that i need its own DVD with server machine.Please send me any ISO image for T620 so that i can download and Burn it on DVD.