Patent ID: 8464003

Claim:
A storage system comprising: a plurality of types of storage devices being configured to be used for forming a plurality of levels of storage tiers, each of the plurality of levels of storage tiers having a plurality of storage areas, a storage area of the plurality of storage areas being allocated to a volume of a plurality of volumes for storing data in accordance with receiving a write command to the volume, the data being data of an object of a plurality of objects handled by a computer coupled to the storage system; and a processor being operable to manage first information between the object and an address in the volume allocated by the computer for storing the object based on information of the object received from the computer, and being operable to obtain a type of storage device of the plurality of types of storage devices corresponding to a level of the plurality of levels of storage tiers defined for storing the data of the object based on a name identifying the object, and being operable to move data of the object from another type of storage device of the plurality of types of storage devices calculated as a location storing the data of the object by using the first information, to the obtained type of storage device.