Patent ID: 7461201
Filing Date: 2008-12-02
Classification: G06F

Abstract:
1. A computer system comprising: a computer; a first storage system coupled to said computer; and a second storage system coupled to said first storage system, wherein said second storage system comprises: a plurality of tape media for storing data; a first storage device capable of performing random access that is an access with randomly different access destinations at a rate higher than the tape medium; a virtual storage device that emulates said first storage device, and a second controller for controlling access to said plurality of tape media and said first storage device, said computer comprises a computer control unit for sending a Copy Indication to the first storage system, said first storage system comprises: a second storage device for storing data; a third storage device having said virtual storage device mapped therewith, and a first controller for controlling data access to said second storage device or said third storage device; said first controller receives said Copy Indication from said computer, performs data copying between said second storage device and said third storage device in response to said Copy Indication and, at this time, sends a Data Access Command indicating said virtual storage device for data access generated in said third storage device to said second storage system, and said second controller reserves a storage space on said first storage device, reads data from an object tape medium, which is a tape medium corresponding to said virtual storage device, of said plurality of tape media, to said storage space, and when a Data Access Command relating to said virtual storage device is received from said first storage system, performs data access to said storage space, rather than to said object tape medium.