发明授权
US5577222A System for asynchronously duplexing remote data by sending DASD data
grouped as a unit periodically established by checkpoint based upon the
latest time value
失效
系统通过发送DASD数据来异步双工远程数据,DASD数据根据最新的时间值由检查点定期建立
- 专利标题: System for asynchronously duplexing remote data by sending DASD data grouped as a unit periodically established by checkpoint based upon the latest time value
- 专利标题(中): 系统通过发送DASD数据来异步双工远程数据,DASD数据根据最新的时间值由检查点定期建立
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申请号: US992219申请日: 1992-12-17
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公开(公告)号: US5577222A公开(公告)日: 1996-11-19
- 发明人: William F. Micka , Claus W. Mikkelsen , Robert W. Shomler
- 申请人: William F. Micka , Claus W. Mikkelsen , Robert W. Shomler
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: G06F12/16
- IPC分类号: G06F12/16 ; G06F11/20 ; G06F13/00
摘要:
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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