Abstract: A control apparatus served as a first control apparatus includes a first information storage unit configured to store therein coupling information relating to a coupling relationship between a plurality of control apparatus and a plurality of devices, the plurality of control apparatus including the first control apparatus and controlling access to the plurality of devices, and a processor. The processor specifies, in response to a first access request to a first device from among the plurality of devices, a second control apparatus responsible for the first device based on the coupling information stored in the first information storage unit, and issues an instruction to access to the first device based on the first access request received by the first control apparatus to the specified second control apparatus through a relay apparatus that relays information to be transferred between the plurality of control apparatus.

Abstract: A control apparatus served as a first control apparatus includes a first information storage unit configured to store therein coupling information relating to a coupling relationship between a plurality of control apparatus and a plurality of devices, the plurality of control apparatus including the first control apparatus and controlling access to the plurality of devices, and a processor. The processor specifies, in response to a first access request to a first device from among the plurality of devices, a second control apparatus responsible for the first device based on the coupling information stored in the first information storage unit, and issues an instruction to access to the first device based on the first access request received by the first control apparatus to the specified second control apparatus through a relay apparatus that relays information to be transferred between the plurality of control apparatus.

Abstract: A storage control device includes a processor to extract a first path to be subjected to load distribution of I/O access from among the first paths connecting virtual disks to a higher-level device in response to scale-out of a storage system based on performance information for the first paths, set a new first path that connects the higher-level device to a new virtual disk having the same space as a virtual disk to which the extracted first path is connected, set a new second path that connects the new virtual disk to an added memory device, use the extracted first path to read existing data stored in the virtual disk connected to the extracted first path, and use the new first path to write and read new data to be written to the new virtual disk as differential data to the existing data.