Computer backup system operable with open files

专利名称：Computer backup system operable with

open files

发明人：Peter B. Malcolm申请号：US08/465925申请日：19950606公开号：US05675725A公开日：19971007

摘要：A backup program for a computer system with a hard disk maintains a record ofchanges made to the data in a file being backed up. During backup both the original andupdate file portions or records are stored, and the backup program reads the originaldata while other applications read the updated data. To identify whether a readoperation is initiated by the backup program or by another application, the systemdetermines, using the stack, the source of the read request. Alternatively it interrogatesthe user, process or task id. Access to the file by the backup program is guaranteed bymanipulating the System File Table. It is ensured that the file is in a `good` state bydelaying the start of the backup operation for a predetermined period.

申请人：CHEYENNE ADVANCED TECHNOLOGY LIMITED

代理机构：Fish & Richardson P

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