Patent ID: 7954104

Claim:
A remote copy storage device system including: a center computer for executing a plurality of task processing; a center storage device connected to said center computer, for storing information obtained as a result of execution of said task processing by said center computer; and a plurality of remote storage devices connected to said center storage device through a plurality of communication lines, respectively, for receiving and storing copy data transmitted by said center storage device; wherein at least one of said center computer and said center storage device includes a load measurement module for measuring load information of each of the plurality of communication lines connecting said center storage device and said plurality of remote storage devices, respectively; said center computer is configured to acquire load information of said communication lines connecting said center storage device and said plurality of remote storage devices, respectively; to extract, among said plurality of communication lines, one of the communication lines, if it is determined by the load measurement module that the acquired load information of the one of the communication links exceeds a predetermined threshold value, as a route switch object communication line; to extract a part of task processing from among task processing relating to the copy data transmitted through the one of the communication lines extracted as said route switch object communication line ; to stop execution of the extracted part of task processing to stop the remote copy relating to the extracted part of task processing; and to report a route switch instruction for switching the transmission route of the copy data relating to the extracted part of the task processing to an other one of the communication lines different from said route switch object communication line to said center storage device and said remote storage device; said center storage device and said remote storage device are configured to receive the report of said route switch instruction and then execute processing for switching the transmission route of said data; said center computer is configured to start execution of the extracted part of task processing to restart the remote copy, and said center computer includes a task priority management table for use in determining priority of task processing, said task priority management table including fields of task priority, task identifiers, hardware identifiers, load upper limit values, load lower limit values and copy type.