Patent ID: 8612704

Claim:
A storage system including: a first storage apparatus comprising: a plurality of storage devices including a first type storage device and a second type storage device having different performance from the first type storage device; and a first controller configured to: manage a first virtual volume including a plurality of virtual areas; allocate a first storage area provided by the first type storage device to a first virtual area of the plurality of virtual areas in accordance with a write operation to the first virtual volume; and change a storage area which allocated to the first virtual area from the first storage area to a second storage area provided by the second type storage device based on access characteristics of the first virtual area of the first virtual volume; and a second storage apparatus comprising: a plurality of storage devices including a third type storage device and a fourth type storage device having different performance from the third type storage device; and a second controller configured to: manage a second virtual volume, which is a copy pair of the first virtual volume, including a plurality of virtual areas; allocate a third storage area provided by the third type storage device to a second virtual area of the plurality of virtual areas in accordance with a write operation to the second virtual volume; receive information corresponding to the access characteristics of the first virtual volume from the first storage apparatus; and change a storage area which allocated to the second virtual area from the third storage area to a fourth storage area provided by the fourth type storage device referring to the information.