Patent ID: 7502904

Claim:
A computer system comprising: a plurality of storage systems having a plurality of disk units which are configured into a plurality of physical storage regions for storing data and a storage controller which provides logical volumes to at least one of a plurality of external devices via a network; a plurality of host computers, coupled to at least one of the storage systems via a network, and accessing logical volumes for using the data, said logical volumes being provided by at least one of the storage systems; and a management computer coupled the host computers and the storage systems via network, wherein said management computer holds location information which indicates where data is stored among the physical storage regions and storage region information which indicates characteristics of said physical storage regions and requirement information which indicates a predefined temporal change in characteristics of physical storage region required for storing data corresponding to type of the data and a time of an event included in data attribute related to the data, wherein said management computer performs a checking of a period between a current time and the time the event related to the data occurs, the time of the event being later than the current time, wherein the management computer sends to the storage system an instruction to migrate data to either of physical storage region according to whether the period being checked corresponds to a predetermined period, the predefined temporal change, and characteristics of physical storage region which is stored with the data, and wherein the storage system migrates data to physical storage region responsive to the instruction.