The enclosure 10 in which the storage control system 600 is constructed comprises a scale-out NAS head group 111 constituted by two or more NAS heads, and a scale-up NAS head 110H that is a higher performance NAS head than each of NAS head members 110L that are the NAS heads constituting the scale-out...http://www.google.fr/patents/US7549019?utm_source=gb-gplus-shareBrevet US7549019 - Storage control system
