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公开(公告)号：DE69312781T2
公开(公告)日：1998-02-12
申请号：DE69312781
申请日：1993-04-13
Applicant: IBM
Inventor： COHN ODED , HARTUNG MICHAEL HOWARD , MICKA WILLIAM FRANK , MCCAULEY JOHN NORBERT , MIKKELSEN CLAUS WILLIAM , NAGIN KENNETH MICHAEL , NOVICK YORAM , WINOKUR ALEXANDER
Abstract: A method and system disclosed for enhanced efficiency of backup copying of designated datasets stored within storage devices (61) coupled to the data processing system via a storage control unit (65) having memory (66) therein. Application execution is temporarily suspended to form a dataset logical-to-physical address concordance to be utilized to administer backup copying. Application initiated updates to uncopied portions of the designated datasets are temporarily deferred until sidefiles of the affected portions are written to memory (66). Portions of the designated datasets are then accessed and copied utilizing selected data retrieval command sequences. A sidefile status query is appended to said command sequences and the presence of data within memory (66) is determined. The sidefiles are then accessed and copied to alternate storage locations in a backup copy order defined by the address concordance.
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Patent Agency Ranking
公开(公告)号：DE69329372D1
公开(公告)日：2000-10-12
申请号：DE69329372
申请日：1993-12-01
Applicant: IBM
Inventor： MICKA WILLIAM FRANK , MIKKELSEN CLAUS WILLIAM , SHOMLER ROBERT WESLEY
Abstract: A system for asynchronously duplexing direct access storage device (DASD) data in a plurality of DASD subsystems has the advantage of decoupling the data duplexing operation from the DASD write I/O operation. This ensures the write does not incur unnecessary wait states in the subsystem. By establishing a sequence checkpoint at which time a set of information packets are grouped together and processed as a single sequence unit, this decoupling and independent operation takes place. Through this independence, data copying to a secondary location can take place without affecting the performance of the subsystems and also not affecting the corresponding integrity of the data that is being updated.
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公开(公告)号：DE69502125D1
公开(公告)日：1998-05-28
申请号：DE69502125
申请日：1995-02-07
Applicant: IBM
Inventor： KERN ROBERT FREDERIC , MICKA WILLIAM FRANK , MIKKELSEN CLAUS WILLIAM , PAULSEN MICHAEL ALOYSIUS , SHOMLER ROBERT WESLEY
Abstract: A remote data shadowing system provides synchronous, storage based, real time disaster recovery wherein a secondary site is located remote from the primary site. An error recovery program at the primary site quiesces applications running thereat for performing error recovery procedures and signalling both primary and secondary locations that failed duplex has occurred. The error recovery program determines the cause of failed duplex, and if error recovery is successful, duplex mode is resumed. If the error recovery program is unable to perform error recovery successfully, then further write updates at the primary site are prohibited and an error message is communicated to operators at both the primary and secondary sites.
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公开(公告)号：DE69329372T2
公开(公告)日：2001-03-01
申请号：DE69329372
申请日：1993-12-01
Applicant: IBM
Inventor： MICKA WILLIAM FRANK , MIKKELSEN CLAUS WILLIAM , SHOMLER ROBERT WESLEY
Abstract: A system for asynchronously duplexing direct access storage device (DASD) data in a plurality of DASD subsystems has the advantage of decoupling the data duplexing operation from the DASD write I/O operation. This ensures the write does not incur unnecessary wait states in the subsystem. By establishing a sequence checkpoint at which time a set of information packets are grouped together and processed as a single sequence unit, this decoupling and independent operation takes place. Through this independence, data copying to a secondary location can take place without affecting the performance of the subsystems and also not affecting the corresponding integrity of the data that is being updated.
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公开(公告)号：DE69502125T2
公开(公告)日：1998-11-19
申请号：DE69502125
申请日：1995-02-07
Applicant: IBM
Inventor： KERN ROBERT FREDERIC , MICKA WILLIAM FRANK , MIKKELSEN CLAUS WILLIAM , PAULSEN MICHAEL ALOYSIUS , SHOMLER ROBERT WESLEY
Abstract: A remote data shadowing system provides synchronous, storage based, real time disaster recovery wherein a secondary site is located remote from the primary site. An error recovery program at the primary site quiesces applications running thereat for performing error recovery procedures and signalling both primary and secondary locations that failed duplex has occurred. The error recovery program determines the cause of failed duplex, and if error recovery is successful, duplex mode is resumed. If the error recovery program is unable to perform error recovery successfully, then further write updates at the primary site are prohibited and an error message is communicated to operators at both the primary and secondary sites.
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公开(公告)号：DE69312781D1
公开(公告)日：1997-09-11
申请号：DE69312781
申请日：1993-04-13
Applicant: IBM
Inventor： COHN ODED , HARTUNG MICHAEL HOWARD , MICKA WILLIAM FRANK , MCCAULEY JOHN NORBERT , MIKKELSEN CLAUS WILLIAM , NAGIN KENNETH MICHAEL , NOVICK YORAM , WINOKUR ALEXANDER
Abstract: A method and system disclosed for enhanced efficiency of backup copying of designated datasets stored within storage devices (61) coupled to the data processing system via a storage control unit (65) having memory (66) therein. Application execution is temporarily suspended to form a dataset logical-to-physical address concordance to be utilized to administer backup copying. Application initiated updates to uncopied portions of the designated datasets are temporarily deferred until sidefiles of the affected portions are written to memory (66). Portions of the designated datasets are then accessed and copied utilizing selected data retrieval command sequences. A sidefile status query is appended to said command sequences and the presence of data within memory (66) is determined. The sidefiles are then accessed and copied to alternate storage locations in a backup copy order defined by the address concordance.
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