Patent ID: 7953940

Claim:
A storage system including a plurality of host systems or a plurality of applications for sending access information, and a storage controller for storing data in a logical volume provided in a storage area of a physical disk; wherein said plurality of host systems or said plurality of applications comprise an insertion unit for inserting an identifier that identifies respective host systems or respective applications into said access information and sending said identifier; and wherein said storage controller comprises: an analysis unit for identifying a host system or an application based on the identifier contained in said access information and analyzing an access cycle of access information to a logical volume sent from the identified host system or application; a data processing unit for controlling the processing of data to be sent from the host system or data to be stored in the logical volume; a management unit, if analysis result of the access cycle is that one access cycle of the analyzed access cycle is comprised by writing data and then reading data and then writing data, for managing the identifier of said host system or said application, the analysis result of the access cycle analyzed with said analysis unit, and a control method for controlling the processing of destaging data from a cache memory after the data processing unit finishes performing the one access cycle to the logical unit on said analysis result or data to be stored in a logical volume; and a data processing controller for destaging data from a cache memory after the data processing unit finishes performing the one access cycle to the logical unit according to the control method managed by said management unit.