Patent ID: 8621119

Claim:
A storage system coupled to a host computer and a management computer, comprising: a plurality of storage devices that are provided as a plurality of logical storage devices to the host computer; an interface unit that is coupled to the management computer; a shared memory that stores control information for the plurality of logical storage devices, said control information including ownership information for the logical storage devices; a plurality of micro-processor packages, each of the plurality of micro-processor packages being associated with at least one micro-processor; wherein the interface unit comprises management information for managing the plurality of micro-processor packages that are in-charge of controlling input/output processing for the storage area of the logical storage devices, and a request transfer unit that transfers an input/output request to the micro-processor package that is in-charge of the input/output processing for the logical storage device based on the management information when the input/output request for the logical storage device is received from the host computer, wherein each of the plurality of micro-processor packages: (1) receives a request for changing ownership from a first micro-processor package, which is in charge of the logical storage device whose load is higher than other logical storage devices, to a second micro-processor package whose load is lower than other micro-processor packages, (2) sets the management information and the control information such that the second micro-processor package is in charge of a logical storage device which the first micro-processor package was in charge of, and (3) outputs a result of the changed ownership to the management computer.