Patent ID: 8863139

Claim:
A management system that manages a plurality of storage subsystems and an information processing apparatus coupled to the storage subsystems and including a virtual layer for virtually providing information from the storage subsystems, the management system comprising: a memory that stores configuration information of logical volumes allocated to virtual instances managed on the virtual layer of the information processing apparatus and operation information of shared hardware resources included in the storage subsystems; and a processor that evaluates use efficiency of the virtual instances based on the configuration information of the logical volumes and the operation information of the shared hardware resources and that outputs an evaluation result of evaluation values of the shared hardware resources; the management system configured to: (A) from first storage subsystems, acquire correspondence information between a first logical volume and hardware resources, and performance information about the hardware resources; (B) from second storage subsystems, acquire correspondence information between pages and first and second logical volumes; (C) from the second storage subsystems or GUI screen of the management system, acquire access characteristics of a virtual logical volume; (D) based on the information acquired by (A) and (C), determine correspondences between the pages and the first and second logical volumes, wherein the second storage subsystem migrate data of the pages between the first and second logical volumes according to determined correspondences, wherein the hardware resources further include a cache, and the performance information includes a capacity of the cache and performance of the cache, and wherein the process (D) further considers a cache utilization of the each first storage subsystem, and a sequential random access ratio respecting address space of the virtual logical volume; and wherein according to the process (D), if the sequential random ratio is high, the pages are migrated to a first storage subsystem about which the cache utilization is low, and wherein according to the process (D), if the sequential random ratio is low, the pages are migrated to a first storage subsystem about which the cache utilization is high.