A partitioned storage subsystem includes a plurality of directors, each having at least one processor thereon, each of the directors acting as one of: a primary director and a secondary director for a subset of logical devices handled by the partitioned storage subsystem, where primary directors actively...http://www.google.com.hk/patents/US7970992?utm_source=gb-gplus-share專利 US7970992 - Asymetrical device distribution for a partitioned storage subsystem
