I've got an Xserve where I've configured a Drobo Pro. Connected via firewire and USB, it works fine, but when connected to a separate network port, it doesn't mount. I've got the Drobo Pro configured to 220.127.116.11/255.255.0.0 and the network port to 18.104.22.168/255.255.0.0. I can ping the IP of the Drobo Pro just fine. I've installed Drobo Dashboard 1.6.8.