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1.发明授权Modular data storage directories for large-capacity data storage units 失效单元功能组构成的文件为大容量存储器的文件存储单元存储分配表
公开(公告)号：EP0284037B1
公开(公告)日：1997-12-29
申请号：EP88104641
申请日：1988-03-23
Applicant: IBM
IPC: G06F12/00 , G06F3/06 , G06F17/30 , G11B7/007 , G11B20/12 , G11B20/18 , G11B27/28 , G11B27/32 , G06F15/40 , G11B7/013
CPC classification number: G06F17/30955 , G06F3/0601 , G06F2003/0697 , G11B7/00745 , G11B20/1252 , G11B20/1883 , G11B27/28 , G11B27/329 , G11B2020/10907 , G11B2020/1224 , G11B2020/1893 , G11B2020/1896 , G11B2220/20 , G11B2220/218 , G11B2220/2537
Abstract: An updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium (20) to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extents are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorde. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable.
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公开(公告)号：DE3856090T2
公开(公告)日：1998-06-25
申请号：DE3856090
申请日：1988-03-23
Applicant: IBM
IPC: G06F12/00 , G06F3/06 , G06F17/30 , G11B7/007 , G11B20/12 , G11B20/18 , G11B27/28 , G11B27/32 , G11B7/013
Abstract: An updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium (20) to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extents are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorde. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable.
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3.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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Patent Agency Ranking
公开(公告)号：BR8801415A
公开(公告)日：1988-11-01
申请号：BR8801415
申请日：1988-03-28
Applicant: IBM
IPC: G06F12/00 , G06F3/06 , G06F17/30 , G11B7/007 , G11B20/12 , G11B20/18 , G11B27/28 , G11B27/32 , G06F12/02
Abstract: An updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium (20) to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extents are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorde. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable.
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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：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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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：DE3856090D1
公开(公告)日：1998-02-05
申请号：DE3856090
申请日：1988-03-23
Applicant: IBM
IPC: G06F12/00 , G06F3/06 , G06F17/30 , G11B7/007 , G11B20/12 , G11B20/18 , G11B27/28 , G11B27/32 , G11B7/013
Abstract: An updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium (20) to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extents are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorde. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable.
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