Storage apparatus and storage apparatus management method performing data I/O processing using a plurality of microprocessors

A method of managing a storage apparatus which is connected via a network to a host apparatus which requests data I/Os,

• the storage apparatus comprising:
• a plurality of microprocessors;
• a plurality of storage areas formed in a drive group configured from a plurality of physical drives;
• and
• a management unit which manages, as the microprocessors which possess ownership to the storage areas, the microprocessors which handle data I/Os to/from one or more storage areas among the plurality of storage areas, the management method comprising:
• a first step in which the management unit detects variations in processing loads of the plurality of microprocessors;
• a second step in which the management unit generates, on the basis of variations in a processing load, load balancing target information which includes information on the storage areas to which the ownership is migrated, information on a migration-source microprocessor serving as the migration source of the ownership, and information on a migration-destination microprocessor serving as the migration destination of the ownership, and
• a third step in which the management unit migrates the ownership to the storage areas with timing such that there is no drop in the processing load of the migration-destination microprocessor contained in the load balancing target information.