Assambling and configuring an Apple Workgroup Cluster for Bioinformatics

I'm assambling and configuring an Apple Workgroup Cluster for Bioinformatics following the steps in Apple's seminar: http://seminars.apple.com/seminarsonline/wgcforbio/apple/index1.html
I have a xserver with 10.4 (the head) with a fixed IP and 2 more xservers with 10.5 (the nodes). All the servers connected with a switch.
I had trouble with the networking at the beginning but I can ping between the servers at last.
When I try to config the Open Directory I can't apply my configuration, the buton is disabled.
Have I to config a DHCP Server for the servers without fixed IP?
Is mandatory to config The Lights Out management and have it running?
Any Idea?
Thank you.

What are they charging you (and why, if you have to go asking for help for them to be able to do their job), and what are you charging them ?

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