JPH04365149A - File backup system for information processing system - Google Patents

Abstract

PURPOSE:To always restore a faulty file without a magnetic tape by simple remodeling. CONSTITUTION:This system is provided with first and second backup files which are not managed by the system. The system is in a state T2 after maintenance work, and a maintenance file is updated into a file B. Thereafter, file switching is performed by a file switching processing means 103, and a state T3 is set, and a state T5 corresponding to a state T1 is set by file copy. If fault occurs in an online file during execution of the maintenance work, contents of the first backup file are copied to the online file, and thereafter, online and maintenance files are switched by the file switching processing means 103. As the result, the online file is in the latest generation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a file backup method for an information processing system that performs online automatic driving.

0002

[Prior Art] Conventionally, a file duplication method has been adopted.
In an information processing system in which online operations and maintenance operations are performed in parallel, an online-related file A and a maintenance-related file B are provided, as shown in FIG. Then, maintenance work is performed on file B while performing online automatic operation, and after the maintenance work is completed, the two files are switched by the file switching processing means 102, and the results of the maintenance work are reflected in the online work. ing.

Conventionally, in such systems, one of the following methods has been used as a method for dealing with file failures. (1) In the first method, as shown in FIG. 5, in addition to online file A and maintenance file B,
A backup file C having contents of one generation before the latest generation is provided. When the maintenance work is completed, the file switching processing means 103 switches file B to the online system, and switches files C and A to the maintenance system and backup system, respectively.
Each file is cyclically switched each time maintenance work is completed. As a result, maintenance operations are reflected in online operations, and files from the latest generation one generation ago are secured as backup files. (2) In the second method, a backup file is secured by saving the file to magnetic tape when the maintenance task is completed or at any appropriate time.

0004

[Problem to be solved by the invention] However, in the first method, if a failure occurs in an online file during maintenance work, it is not possible to restore the online file to the latest generation file. is impossible. In addition, since a backup file C managed by the system is provided, the file switching processing means 10
The modification details in 3 are complicated, and therefore the number of man-hours required for modification is large.

[0005] In addition, in the second method, in order to always maintain a state in which files can be restored to the latest generation, it is necessary to save the files to magnetic tape every time maintenance work is completed. In a system that operates on a regular basis, the burden of system operation becomes large. Furthermore, since it takes time to recover files from magnetic tape, the system remains in a failed state for a long time.

An object of the present invention is to solve such problems, to enable file backup of an information processing system that always allows restoration to the latest generation of files, to facilitate system modification, and that does not use magnetic tape. The goal is to provide a method.

[0007]

[Means for Solving the Problems] The present invention includes an online file, a maintenance file, and a first file switching processing means for switching between these two files, and uses the online file to perform online automatic operation. In a file backup method for an information processing system that performs a second file switching processing means for switching between the first and second backup files;
A copy processing means for copying contents from one of the files to another one of the files is provided.

[0008]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the flow of processing in an example of an information processing system based on the file backup method of the present invention. This system includes online files, maintenance files, and first and second backup files that are not managed by the system. In the normal state T1 of the system, each file of the online system, maintenance system, and first backup system has the same contents as file A, and the second
The backup file is file A', which is one generation before file A.

[0009] State T2 is a state after maintenance work has been performed, and the maintenance file is updated and becomes file B.

[0010] When the maintenance work is completed, the online work is interrupted, and the file switching processing means 103 switches the file, resulting in state T3. That is, the file switching processing means 103 refers to the file management table 104 and updates the file management information, thereby switching the online file A to the maintenance file and the maintenance file B to the online file. On the other hand, the first and second backup files are switched by a predetermined file switching processing means, not by the file switching processing means 103,
The first backup file is file A',
The second backup file becomes file A.

[0011] In state T4, online business is resumed using the latest file B. At this time, in the background, the contents of the online file B are copied to the maintenance file by the file copy processing means 105, and as a result, the maintenance file also becomes the latest file B.

[0012] In state T5, the online business is continued using the latest file B, and in the background, the contents of the online file B are copied to the first backup file by the file copy processing means 106. , the first backup file is also the latest file B. As a result, a state similar to state T1 is reached, maintenance work is restarted, and similar processing is repeated.

Next, file recovery in the case where a failure occurs in an online file during execution of maintenance work in the information processing system of this embodiment will be explained with reference to FIG. Status T21 indicates a state in which maintenance work is being executed, and the online files and the first backup file are file A, the maintenance file is file B, and the second backup file is the file A one generation earlier. File A' which is a file
It becomes. If a failure 204 occurs in the online file A in such a state, the first backup file A is copied to the maintenance file by the file copy processing means 205, and the maintenance file is replaced with the normal file A. becomes. In this state T22, the file switching processing means 103 switches between the online file and the maintenance file with reference to the file management table 104, and also switches the first and second backup files, resulting in state T23. becomes. The online business is then restarted using the latest generation file A.

Next, file recovery when a failure occurs in a maintenance file during execution of maintenance work will be explained with reference to FIG. Status T31 indicates a state in which maintenance work is being executed; online files and first backup files are file A, maintenance files are file B, and second backup file is
The backup file is file A', which is a file one generation before file A. If a failure 303 occurs in maintenance file B in such a state, the first backup file A is copied to the maintenance file by the file copy processing means 304, and the maintenance file becomes file A in the normal state. . Therefore, in this state T32, it is possible to restart the maintenance work with the latest generation file A. In this case, since online files are not accessed at all, maintenance files can be restored and maintenance operations can be resumed without affecting online operations.

[0015]

As explained above, the file backup method for an information processing system according to the present invention includes an online file, a maintenance file, and a first file switching processing means for switching between these two files. In a file backup method for an information processing system that performs online automatic operation using system files, a first backup file with the same content as the online system file and a second backup system file with the same content as the online system file one generation ago are used. A backup file, a second file switching processing means for switching between the first and second backup files, and a copying processing means for copying contents from one of the files to another one of the files are provided. Features.

[0016] Therefore, if a failure occurs in an online file during maintenance work, the contents of the first backup file are copied to the maintenance file by the file copy processing means, and then
By switching between the online file and the maintenance file using the first file switching processing means, the online file is restored, and the online business can be restarted using the latest generation file. In other words, even if a failure occurs in an online file during maintenance work, it can be recovered in a short period of time because the only processing required is copying and switching files, and no magnetic tape is used. file recovery can be completed. Furthermore, since the first and second backup files are not managed by the system, there is no need to modify the first file switching processing means.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the flow of processing in an example of an information processing system based on the file backup method of the present invention.

FIG. 2 is a diagram showing the flow of file recovery processing when a failure occurs in an online file in an example of an information processing system based on the file backup method of the present invention.

FIG. 3 is a diagram showing the flow of file recovery processing when a failure occurs in a maintenance file in an example of an information processing system based on the file backup method of the present invention.

FIG. 4 is a diagram showing the configuration and switching of files in a conventional information processing system.

FIG. 5 is a diagram showing a file configuration and switching in another conventional information processing system.

[Explanation of symbols]

103 File switching processing means 104 File management table 105, 106, 205, 304 File copying processing means

Claims (3)

[Claims] 1. An information processing system comprising an online file, a maintenance file, and a first file switching processing means for switching between these two files, and performing online automatic operation using the online file. In the file backup method, a first backup file having the same content as the online file, a second backup file having the same content as the online file one generation ago, and the first and second backup files A file backup method for an information processing system, comprising: second file switching processing means for switching files; and copying processing means for copying contents from one of the files to another one of the files. 2. A file backup method for an information processing system according to claim 1, wherein said first file switching processing means switches files by referring to a predetermined file management table. 3. The file copy processing means copies the contents of the online file to the maintenance file or the first backup file, or copies the contents of the first backup file to the maintenance file. 2. A file backup method for an information processing system according to claim 1.