Patent ID: 6954839

Claim:
A control server coupled to a server device and at least one storage device, comprising: an interface unit coupled to said server device and said at least one storage device; a memory device for storing correspondence relationships between physical storage areas and virtual volumes, wherein said physical storage areas being included in said at least one storage device, and said virtual volumes being virtual storage areas; and a control device for controlling said interface unit and said memory device, wherein said interface unit receives a request including an address of a virtual volume from said server device, wherein said control device converts said address of said virtual volume included in said request into an address of a physical storage area based on said correspondence relationships stored in said memory device, wherein said interface unit transmits a read instruction including said address of said physical storage area obtained by the conversion performed by said control device to a storage device so that said storage device will read out data, and wherein said storage device including a storage area indicated by said address of said physical storage area, said data being stored in said storage area.