For our company there was a need to do some expansion and we decided to do that with the Dell R200.

Since it was just the new version of the PowerEdge 860 ( an other server we have ) I thought it would be fairly easy to install this machine, since I had the kickstart and all other docs and scripts of the 860 installation. But that turned out otherwise.
After trying and failing several times, it was time for googling.
Went through several pages till I hit this one: http://www.jameslittle.me.uk/installing-centos-5-on-a-dell-r200/

It saved my day.