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公开(公告)号：AT358848T
公开(公告)日：2007-04-15
申请号：AT05701462
申请日：2005-01-07
Applicant: IBM
Inventor： SHACKELFORD DAVID MICHAEL , MCBRIDE GREGORY EDWARD
IPC: G06F11/20
Abstract: Provided are a system and article of manufacture for copying storage, wherein a first unit receives data updates from a second unit. The data updates are stored in a plurality of physical storage locations associated with the first unit. Links are generated to at least one of the plurality of physical storage locations to achieve consistent data between the first unit and the second unit.
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12.发明专利
公开(公告)号：GB2359393B
公开(公告)日：2004-03-17
申请号：GB0023111
申请日：2000-09-21
Applicant: IBM
Abstract: A system, method, and program for maintaining data consistency among updates to data storage areas are provided. Each update has an update time the update was made. There are multiple groups of data storage areas. For each group, updates to the data storage area in the group are stored in a journal for storing updates to the group, wherein there are multiple journals. An indication is made in a memory area for each group of a group update time comprising a most recent update time of the updates in the group. The update time for each update in the group is not greater than the group update time. A determination is made of a minimum group update time across all the groups. At least one update is applied to storage if the update time for the update does not exceed the minimum group update time. The data storage areas may be partitioned among a plurality of computer systems, and may be maintained in at least one primary and secondary storage. The data storage areas may also comprise volumes, with each group including at least one volume. The groups of updates may also be maintained in a journal.
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公开(公告)号：DE69502651T2
公开(公告)日：1999-02-25
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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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：DE69031862D1
公开(公告)日：1998-02-05
申请号：DE69031862
申请日：1990-10-22
Applicant: IBM
Inventor： MCBRIDE GREGORY EDWARD , PENCE JERRY WAYNE , VAN HISE DAVID GREGORY
Abstract: A method for balancing the loads on channel paths in a digital computer during long running applications is disclosed. Only the load associated with relatively long running applications is monitored. For each volume of data eligible for processing, the selection of volumes is first made from those having affinity to the calling host. The load across the respective connected channel paths is calculated. The calculation is weighted to account for the different magnitudes of load resulting from different applications and to prefer the selection of volumes connected to the fewest unused channel paths such that processing of the selected volume will maintain the maximum number of unused channel paths. The optimal volume is selected as the next volume to be processed. The monitored load on each channel path is then updated to include the load associated with the newly selected volume, assuming that the load associated with processing the volume is distributed evenly across the respective connected channel paths. The selection of the following volume is then based on the updated load information and the method continues cyclically during subsequent selection of the remaining volumes for processing.
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公开(公告)号：DE602006009708D1
公开(公告)日：2009-11-19
申请号：DE602006009708
申请日：2006-11-21
Applicant: IBM
Inventor： BOYD KENNETH WAYNE , FLYNN JOHN THOMAS , KERN ROBERT FREDERIC , MCBRIDE GREGORY EDWARD , MICKA WILLIAM FRANK , SHACKELFORD DAVID MICHAEL
IPC: G06F11/14
Abstract: An apparatus, system, and method are disclosed for continuously protecting data. A mirror module mirrors a primary record set to a base record set. A log module accumulates each record change to the primary record set in a log. A change selection module selects a record change from the log. A change application module applies the selected record change to the base record set to form a recovered record set.
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公开(公告)号：GB2359393A
公开(公告)日：2001-08-22
申请号：GB0023111
申请日：2000-09-21
Applicant: IBM
Abstract: Primary mass storage devices 56 are organised into groups A,B,C, and updates made to stored data therein are written to respective journals 60 for subsequent application to the mirror stores 58. The time of the latest update for each group A,B,C is stored in the master data set MDS. Updates stored and timestamped in the journals are copied into the respective backup store when their timestamp precedes the earliest of the times stored in the master data set. The invention allows data consistency to be maintained among groups of stores. The invention may be used in data recovery.
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公开(公告)号：DE69031862T2
公开(公告)日：1998-06-25
申请号：DE69031862
申请日：1990-10-22
Applicant: IBM
Inventor： MCBRIDE GREGORY EDWARD , PENCE JERRY WAYNE , VAN HISE DAVID GREGORY
Abstract: A method for balancing the loads on channel paths in a digital computer during long running applications is disclosed. Only the load associated with relatively long running applications is monitored. For each volume of data eligible for processing, the selection of volumes is first made from those having affinity to the calling host. The load across the respective connected channel paths is calculated. The calculation is weighted to account for the different magnitudes of load resulting from different applications and to prefer the selection of volumes connected to the fewest unused channel paths such that processing of the selected volume will maintain the maximum number of unused channel paths. The optimal volume is selected as the next volume to be processed. The monitored load on each channel path is then updated to include the load associated with the newly selected volume, assuming that the load associated with processing the volume is distributed evenly across the respective connected channel paths. The selection of the following volume is then based on the updated load information and the method continues cyclically during subsequent selection of the remaining volumes for processing.
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