After I wrote my previous blog post with instructions to set up a Drobo in Linux, I noticed that the write performance was really bad and when I deleted files the LEDs showing the used space would not go out. Clearly something was not set up correctly.
Update: After writing this blog post, I ran into a number of problems and redid my setup in a different way.
Yesterday my brand new Drobo arrived. I ordered it online together with 2 Seagate ST31000340AS Barracuda 1TB drives. Even though the Linux support by Data Robotics is still in beta, I was able to get the Drobo up and running on my Ubuntu 8.10 server.