Just setting up a new Xserve with four 180GB drives headlessly (no monitor or keyboard attached). All the drives (other than the boot volume) were named the same from apple (ServerHD). In WGM, the drives would just show up as one drive. Also, if I tried to connect via AFP, only one drive would show up. I called Apple and they offered little help to configure it headless, since they don't support CLI tools.
The only work around is to attach a monitor and keyboard and rename the drives the old fashion way.
Just a heads up for anyone who wants to configure a headless Xserve with more than two factory installed drives.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030415152846755