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Patent Agency Ranking
公开(公告)号：DE69502651D1
公开(公告)日：1998-07-02
申请号：DE69502651
申请日：1995-02-07
Applicant: IBM
Inventor： KERN ROBERT FREDERIC , KERN RONALD MAYNARD , MCBRIDE GREGORY EDWARD , SHACKELFORD DAVID MICHAEL
Abstract: A remote data shadowing system provides storage based, real time disaster recovery capability. Record updates at a primary site cause write I/O operations in a storage subsystem therein. The write I/O operations are time stamped and the time, sequence, and physical locations of the record updates are collected in a primary data mover. The primary data mover groups sets of the record updates and associated control information based upon a predetermined time interval, the primary data mover appending a prefix header to the record updates thereby forming self describing record sets. The self describing record sets are transmitted to a remote secondary site wherein consistency groups are formed such that the record updates are ordered so that the record updates can be shadowed in an order consistent with the order the record updates cause write I/O operations at the primary site.
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公开(公告)号：DE602004005344D1
公开(公告)日：2007-04-26
申请号：DE602004005344
申请日：2004-06-15
Applicant: IBM
Inventor： KERN ROBERT FREDERIC , PETERSEN DAVID , LUDVIG RUNE WILLY
IPC: G06F11/20
Abstract: Provided are a method, program, and system for managing data. A mirror policy is processed indicating volumes in a first storage system to mirror to volumes in a second storage system and volumes in the second storage system to mirror to volumes in a third storage system, wherein the third storage system is at a first geographical location remote with respect to a second geographical location including the first and second storage systems. A failure is detected of the first and second storage systems at the first geographical location. Automatic reconfiguration is made to network resources directing I/O requests to volumes in the first storage system to direct I/O requests to volumes in the third storage system. A failure of the first storage system and the availability of the second storage system is detected and, in response, network resources are reconfigured to direct I/O requests to volumes in the first storage system to volumes in the second storage system in response to detecting the failure of the first storage system and the availability of the second storage system. Updates to the second storage system are copied to the third storage system after reconfiguring network resources to direct I/O requests to volumes in the first storage system to volumes in the second storage system.
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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：DE69311952T2
公开(公告)日：1998-01-15
申请号：DE69311952
申请日：1993-04-13
Applicant: IBM
Abstract: Backup copying at a first selected point in time is performed in a data processing system on a storage subsystem concurrent with an application execution by first suspending application execution only long enough to form a logical-to-physical address concordance, and thereafter physically backing up the datasets on a scheduled or opportunistic basis. An indication of each update to a selected portion of the designated datasets occuring after the first selected point in time is stored and application initiated updates to uncopied designated datasets are first buffered. Thereafter, sidefiles are made of the affected datasets, or portions thereof, the updates are then written through to the storage subsystem, and the sidefiles written to an alternate storage location in backup copy order, as controlled by the address concordance. At a subsequent point in time only those portions of the designated datasets which have been updated after the first selected point in time are copied, utilizing an identical technique.
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公开(公告)号：DE69311952D1
公开(公告)日：1997-08-14
申请号：DE69311952
申请日：1993-04-13
Applicant: IBM
Abstract: Backup copying at a first selected point in time is performed in a data processing system on a storage subsystem concurrent with an application execution by first suspending application execution only long enough to form a logical-to-physical address concordance, and thereafter physically backing up the datasets on a scheduled or opportunistic basis. An indication of each update to a selected portion of the designated datasets occuring after the first selected point in time is stored and application initiated updates to uncopied designated datasets are first buffered. Thereafter, sidefiles are made of the affected datasets, or portions thereof, the updates are then written through to the storage subsystem, and the sidefiles written to an alternate storage location in backup copy order, as controlled by the address concordance. At a subsequent point in time only those portions of the designated datasets which have been updated after the first selected point in time are copied, utilizing an identical technique.
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