Patent ID: 8214587

Claim:
A storage apparatus comprising: at least one channel board that receives a data I/O request sent from an external apparatus; at least one drive board that performs any one of writing and reading of data to and from a storage device including a plurality of storage drives, in response to the received data I/O request; a cache memory that stores write data that is to be written to the storage device, or read data that is read from the storage device; a plurality of processor boards that transfer data between any two of the channel board, the drive board, and the cache memory; and a shared memory accessible from the processor boards, wherein the processor boards each include a microprocessor, and a local memory whose accessibility from the microprocessor is higher than the shared memory, the storage device provides a storage area of the storage drives in units of an LDEV being a logical storage area, the channel board stores a frame transfer table containing information indicative of correspondence between the LDEV and each of the processor boards, the correspondence set in accordance with a right of ownership that is a right of access to the LDEV set for each of the processor boards, each of the processor boards stores, in the local memory, LDEV control information as information which each processor board refers to at a time of access to the LDEV for which the processor board has the right of ownership, each of the processor boards stores LDEV control information in the local memory, the LDEV control information being information to be referred to by the processor board at the time of access to the LDEV for which the processor board has the right of ownership, and the channel board transfers a data frame that forms the received data I/O request, to one of the processor boards corresponding to the LDEV specified from the information contained in the data frame in the frame transfer table.