 The largest registered academic cluster, having 8632 CPUs, is GridKa, operated by the Karlsruhe Institute of Technology in Karlsruhe, Germany.There are also a number of clusters ranging down to fewer than 10 CPUs, representing the early stages in the construction of larger systems, as well as being used for courses in cluster design.This easy scalability was a major goal in the development of Rocks, both for the researchers involved, and for the NSF