Patent ID: 7272661

Claim:
A switch connected between a plurality of server nodes and a plurality of storage subsystems, said switch comprising: first connection ports configured for being connected to connection ports of said plurality of server nodes; second connection ports configured for being connected to connection ports of said plurality of storage subsystems; a storage management table indicating storage subsystems accessible by each server node respectively, said storage subsystems being accessed according to a storage management group and a storage access definition group, wherein at least one storage management group includes two or more storage subsystems and at least one storage access definition group includes constituent disk devices from two or more storage subsystems, and wherein said storage management table is created on the basis of route mapping information input from a management terminal through said second connection ports; an access route mapping table indicating connection routes from said server nodes to their correspondingly accessible storage subsystems as indicated by said storage management table, wherein said server nodes access said storage subsystems according to said connection routes; and a crossbar for switching connection between said first connection ports and said second connection ports in accordance with information contained in said storage management table and said access route mapping table.