Patent ID: 8904121

Claim:
A computer system comprising a storage apparatus, a host computer requesting writing of data to the storage apparatus, and a management computer configured to manage the storage apparatus and the host computer, wherein the storage apparatus, the host computer, and the management computer are connected to each other using a network, wherein the storage apparatus includes: a plurality of kinds of storage media with different I/O performance; and a control unit configured to manage storage areas, which are provided by the plurality of kinds of storage media with the different I/O performance, as storage tiers; wherein the control unit is configured to allocate a storage area from the storage tiers to a data storage area of a volume or volumes storing the data in response to a request from the host computer to write the data, to obtain I/O frequency information of the data stored in the volume or volumes, and to provide the I/O frequency information to the management computer; wherein the management computer includes: a storage unit configured to store a pool structure information table for managing structure information of the storage tiers; and a control unit configured to manage the structure of the storage tiers of the storage apparatus; and wherein the control unit is configured to obtain storage media information, including the I/O frequency of data stored in the volume or volumes, as well as structure information and the I/O performance of the storage media, from the storage apparatus, to identify a storage area of storage media with low I/O performance, which are not allocated to any of the volumes, from among the storage media with higher I/O performance than the I/O frequency of the data stored in the volume or volumes, on a basis of the structure information of the storage media, and to issue an instruction to the storage apparatus to create the storage tiers by using a storage area of the identified storage media.