Patent ID: 8954671
Filing Date: 2015-02-10
Classification: G06F

Abstract:
1. A computer system in which a storage apparatus, a host computer configured to issue a data write request to the storage apparatus, and a management computer configured to manage the storage apparatus and the host computer are each interconnected via a network, the storage apparatus comprising: a controller configured to manage storage areas provided by storage media of a plurality of types of varying performance as pools, and to assign the storage areas in page units to a virtual volume from any tiered storage among a plurality of types of tiered storage which the pool comprises in response to the data write request from the host computer, wherein, for specific data which is managed by the host computer, the controller is configured to specify a storage area with a high referencing frequency among the specific data on the basis of organization information of the specific data, and to move the storage area with the high referencing frequency among the specific data to another of the tiered storage with a higher performance than an already assigned tiered storage, wherein the frequency with which data is referenced is determined in accordance with an I/O frequency management table, wherein the I/O frequency management table includes file organization field information and at least one field storing frequently-referenced I/O information for each of a plurality of file organizations, wherein the tiered storage with a highest performance is specified on the basis of the organization information, data with a highest I/O frequency is placed in an upper tiered storage, and data with a next highest I/O frequency is placed in a tiered storage other than the upper tiered storage, the placement of the data being controlled in accordance with the I/O frequency management table, and wherein the specific data is data that is managed by the host computer.