Method and system for concurrent access during backup copying of data.
摘要
<p>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. <IMAGE></p>
申请公布号
EP0566968(A2)
申请公布日期
1993.10.27
申请号
EP19930105993
申请日期
1993.04.13
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
COHN, ODED;HARTUNG, MICHAEL HOWARD;MCCAULEY, JOHN NORBERT, JR.;MICKA, WILLIAM FRANK;MIKKELSEN, CLAUS WILLIAM;NAGIN, KENNETH MICHAEL;NOVICK, YORAM;WINOKUR, ALEXANDER