Patent ID: 8255666

Claim:
A storage system coupled to a host computer and a management apparatus, comprising: a plurality of storage devices accessed by the host computer; and a control unit that controls the plurality of storage devices, wherein the control unit: sets a first-type virtual device corresponding to the plurality of storage devices, the first-type virtual device including a plurality of first-type logical devices, wherein the plurality of first-type logical devices includes at least one first first-type logical device and at least one second first-type logical device, the at least one first first-type logical device being allocated to a volume accessible by the host computer; sets a second-type virtual device including a second-type logical device, which is a virtual volume accessible by the host computer; and allocates each second first-type logical device, of the plurality of first-type logical devices, to a storage pool, and wherein when the control unit receives first write data for the first first-type logical device included in the first-type virtual device, the control unit stores the first write data in the first first-type logical device, and when the control unit receives second write data for the second-type logical device included in the second-type virtual device, the control unit associates at least one second first-type logical device, of the first-type virtual device and allocated to the storage pool, with the second-type logical device, and stores the second write data in the second first-type logical device.