Patent ID: 8683171

Claim:
A storage system comprising: a first storage apparatus coupled to a computer; and a second storage apparatus coupled to the first storage apparatus and the computer, wherein: the first storage apparatus includes: first physical storage devices accessed by the computer; and a first control unit for controlling the first physical storage devices; and the second storage apparatus includes: second physical storage devices; and a second control unit for controlling the second physical storage devices, wherein: a first logical device which corresponds to a storage area that is set in at least one of the first physical storage devices and a second logical device that is a virtual storage device, wherein: the first control unit transmits system constitution information of the storage system to the second storage apparatus; the second control unit constitutes a third logical device and a fourth logical device based on the constitution information; the third logical device corresponds to a storage area that is set in at least one of the second physical storage devices; and the fourth logical device is the virtual storage device, wherein: when write data to the second logical device from the computer is received: the first control unit: allocates a certain storage area of the second logical device for each storage area of the first logical device and the third logical device; stores the write data to the allocated storage area of the first logical device; and transmits the write data to the second storage apparatus; and the second control unit: stores the write data to the allocated storage area of the third logical device.