Computer backup system operable with open files

Details Computer backup system operable with open files Computer backup system operable with open files

1995-06-06

1997-10-07

Canney, Vincent P.

Boots, shoes, and leggings

3642682, G06F 1100

Patent

active

056757255

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

REFERENCES:
patent: 4686620 (1987-08-01), Ng
patent: 5065354 (1991-11-01), Jons et al.
patent: 5163148 (1992-11-01), Walls
patent: 5241669 (1993-08-01), Cohn et al.
patent: 5241670 (1993-08-01), Eastridge et al.
Peter G. Galvin, "Operating System Concepts", pp. 373-379, 1994.

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