A storage system 10 enables control by more processors 201 in accordance with reducing the resource size required per EP in a communication network to which MR-IOV is applied. The storage system 10 includes a plurality of processors 201 and a plurality of CMs 209. The internal network of the storage system 10 is configured such that each processor 201 is able to dual-write write data to a CM 209 in a FE-CM data transfer, and to transfer the write data from one of the dual-write CMs 209 to the BE in a CM-BE data transfer.