STORAGE SYSTEM, METHOD, AND PROGRAM, COMPRISING A PLURALITY OF STORAGE DEVICES

摘要

In the entire system including plural source storage devices, a new selection method is provided, which a target storage device selects which source storage device to accept a copy request from the target storage device so as to minimize the load on the entire system. [Solution]The target storage device must select a source storage device as a copy request destination of a specific data in the entire system. A first and a second source storage device are in processing plural data. Firstly The method calculates first and second load values as job loads being processed respectively. A first total system load value for the entire system is given by adding a job load value of the specific data to the first load value for the first source storage device as a first final load value and then adding the second load value to the first final load value. Furthermore a second total system value for the entire system is given by adding the job load value of the specific data to the second load value for the second source storage device as a second final load value and then adding the first load value to the second final load value. Lastly the first total system value is compared with the second total system value to select which can minimize the load on the entire system, the first source or second source storage device.