JPH0314122A - Backup system for working data file against fault of magnetic disk device - Google Patents

Abstract

PURPOSE:To facilitate the restoration of a working data file by instructing the restoration by generating control information for restoring the working data file at the time of a fault, exchanging for a magnetic disk device for exchange generated in the system in advance, and thereafter, restoring a necessary working data file. CONSTITUTION:In the case the fault occurs in a magnetic disk device 2, the magnetic disk device 2 is exchanged for a magnetic disk device 4 for exchange by a maintenance person. Thereafter, when a restoration program 9 is executed, the restoration program 9 refers to the restoration information of a magnetic disk device 3, writes restoration information and the contents of a working data file designated by the restoration information in the magnetic disk device 4 for exchange, and thereafter, restarts a working processing program 5. In such a manner, the contents of the latest working data file can be reserved with high reliability even against the fault of the magnetic disk device. Also, the time required for restoring the file can be shortened, and it becomes possible to cope quickly with restarting the working processing at the time of the fault.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a computer system capable of storing business data in a magnetic storage device, and more particularly to a method for backing up business data files in case of a magnetic disk failure.

(Prior Art) Conventionally, in a computer system in which business data is stored in a magnetic disk device, business data files stored in the magnetic disk are backed up after the day's business is completed. That is, a method is known in which the contents stored in a magnetic disk device are collectively backed up to a floppy disk device, a magnetic tape device, or the like after the end of the day's work.

(Problems to be Solved by the Invention) In the conventional business data file backup method described above, if a magnetic disk failure occurs during business processing,
There is a drawback that there is a risk that business data stored from the start of the day's business to the time of occurrence of a failure may be destroyed.

Another drawback is that it takes a long time to back up the contents stored on the magnetic disk after the end of the job, which imposes a heavy burden on the operator.

An object of the present invention is to create control information for recovering business data files in the event of a failure in a system that has a plurality of magnetic disk devices for storing the same content and can perform double writing of business data; The above disadvantages can be removed by instructing the recovery of business data files in the event of a failure, replacing them with a replacement magnetic disk device that has been generated by the system in advance, and then restoring the necessary business data files according to the relevant instructions. An object of the present invention is to provide a method for backing up business data files against a failure in a magnetic disk device, which is configured so that business data and tough files can be easily restored in the event of a device failure.

(Means for Solving the Problems) A method for backing up business data files in response to a failure in a magnetic disk device according to the present invention includes a pair of magnetic disk devices, a dual writing means, a control information creation means, a recovery instruction means, This configuration includes a third magnetic disk device.

The pair of magnetic disk devices are for storing the same contents, and the third magnetic disk device is system-generated in advance for replacement, and is used to restore business data files by a recovery instruction from a recovery instruction means after the replacement. belongs to.

The double writing means is for executing double writing of business data to a pair of magnetic disk devices.

The control information creation means is for creating control information for recovery of business data files in the event of a failure.

The recovery instruction means is for instructing recovery of business data files in the event of a failure.

(Implementation row) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a system diagram showing an embodiment of a method for backing up business data files in case of failure of a magnetic disk device according to the present invention.

In FIG. 1, 1 is an auxiliary storage device that constitutes the system, 2 and 3 are magnetic disk devices, 4 is a replacement magnetic disk device, 5 is a business processing program, B is business data generated during business processing, 7 8 is a business processing program for writing data to a magnetic disk device, 8 is a recovery information setting program for setting recovery information, and 8 is a recovery information setting program for recovering business data files and recovery information according to the recovery information set in the information setting program 8. This is a recovery program for

The operation of the apparatus of the invention shown in FIG. 1 includes the following eight stages.

The first stage is a stage of setting recovery information as shown in FIG.

In FIG. 2, 81 is a recovery information setting screen displayed by the recovery information setting program 8, 21p61 is recovery information, and the recovery information set on the recovery information setting screen 81 is stored. Recovery information setting screen 8
1, recovery information is selected and set as necessary after system generation and during business processing.

The second stage is a business data writing stage as shown in FIG. In Figure 3, 22 and 52 are business data files, and 22 and 52 are magnetic disk devices, respectively.
The business data 6 generated by the business processing program 5 of , 3 is sent to the write processing program 7Kff. In write processing 7, write processing is performed once for the business data file 22 and once for the business data file 32. Accordingly, the same contents are stored in the business data file 22.52.

The third stage is a recovery stage in the event of a failure as shown in FIG. In FIG. 4, magnetic disk drive #2 is shown as an example.
This section explains what happens when a failure occurs. When a failure occurs in the magnetic disk device t2, a maintenance person replaces the magnetic disk device 2 with a replacement magnetic disk device 4. After that, when the recovery program 9 is executed, the recovery program 9 refers to the recovery information 31 of the magnetic disk device 6 and transfers the contents of the business data file specified by the recovery information s1 and the recovery information 31 to the replacement magnetic disk device 4. Write. Thereafter, the business processing program 5 is restarted.

(Effects of the Invention) As explained above, the present invention allows the contents of the latest business data file to be highly reliable even in the event of a failure of the magnetic disk device by always writing the same business data to each individual magnetic disk device. It also has the effect of saving you the trouble of backing up your data at the end of your business.

Furthermore, by preparing a replacement magnetic disk in advance with files that will never be updated by operations such as system control programs, and creating recovery information,
This has the effect of shortening the time required to restore files and allowing quick response to resume business processing in the event of a failure.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of a method for backing up business disk files in response to a failure of a magnetic disk device according to the present invention. FIG. 2 is an explanatory diagram showing the concept of recovery information setting. Figure 3 is a diagram. Figure 4 is a clear diagram. 11111 Auxiliary storage device 2 to 4...Magnetic disk device 5@...Business processing program 6...Business data 7-3 Write processing program 8#-Recovery information setting program 9 a m number recovery program 21. 51-...Recovery information 22,! ! -...Business data file 81...Recovery information setting screen Explanation showing the concept of writing business data.Explanation showing the concept of recovery in the event of a failure.

Claims (1)

[Claims] a pair of magnetic disk devices for storing the same content;
a double writing means for executing double writing of business data to the pair of magnetic disk devices; a control information creation means for creating control information for recovery of the business data file in the event of a failure; and the failure. a recovery instruction means for instructing the recovery of the business data file at the time of the exchange; and a third system generated in advance for the exchange, for restoring the business data file according to a recovery instruction from the recovery instruction means after the exchange. 1. A method for backing up business data files in response to a failure of a magnetic disk device, characterized in that the system is configured to include a magnetic disk device.