DEETANOBATSUKUATSUPU*KOPIICHUNODOJIAKUSESUNOHOHOOYOBISHISUTEMU

摘要

Method and system are disclosed for permitting high concurrency of access during backup copying of designated data stored within a storage subsystem including multiple storage devices (61) coupled to the data processing system via storage control unit (65) having memory (66). Data within each storage device is accessed utilizing a Unique Control Block (UCB), identifying a selected storage device, and an associated data retrieval command sequence identifying the data to be accessed. Portions of the data copied to memory (66) as sidefiles from a first storage device may be accessed utilizing a UCB associated with an alternate storage device by associating a selected data retrieval command sequence therewith which identifies the data as stored within memory (66). In this manner, data from a first storage device may be accessed utilizing an alternate UCB, permitting concurrent access of data utilizing the UCB associated with the first storage device.