Patent ID: 8275937

Claim:
A storage system having a storage device that includes a storage medium providing a plurality of unit logical storage areas used as data storage areas of an external apparatus and a plurality of processing devices communicatively coupled to the storage device to execute data IO processes for the unit logical storage areas from the external apparatus, the storage system comprising: a responsible processing device retaining unit that retains the unit logical storage areas and the processing devices executing the data IO processes of the unit logical storage areas in a correlated manner; a storage function retaining unit that retains the unit logical storage areas and storage function information that is information set for the unit logical storage areas to indicate usage aspects of the unit logical storage areas in a correlated manner; and a processing device changing unit that acquires from the responsible processing device retaining unit the processing device correlated with each of the logical storage areas based on the storage function set for the unit logical storage areas acquired from the storage function retaining unit for the unit logical storage areas to determine whether a change of the responsible processing device is necessary, the processing device changing unit changing the processing device correlated with the logical storage area to different one of the processing devices if it is determined that the change is necessary.