management console 5 is described separately in the fifth embodiment in the diskarray switch 20 the communications controller 204 acquires the setup information and sets the structural information such as the address space information for each of the diskarray subsets 10 by means of the mp 200 the mp 200 distributes the structural information of the diskarray subset 10 to the each of the host i f nodes 203 and the diskarray i f nodes 202 by way of the crossbar switch 201 when the nodes 202 and 203 receive this information the sp 2021 stored this structural information in the dct 2027 in the diskarray subset 10 the diskarray subset configuration manager means 106 acquires the setup information and stores it in the shared memory 102 the host mpu 1010 and the lower mpu 1030 refer to this setup information in the shared memory 102 and perform configuration management the operation when the read command is issued is described next for the diskarray system 1 with a host u201c 2 u201d fig1 is a model view showing the sequence of frames sent by way of the fiber channel during read operation from the host fig1 a through 13c are flowcharts of the processing in the host i f node 203 during write processing in the following description it is.