JPH0581103A - System for restoring duplexing film - Google Patents

Abstract

PURPOSE:To execute restoration to a duplexing file without stopping a system and also interfering with job when one of the files becomes interference. CONSTITUTION:When file restoration request is executed from a console 1, a file input/output processing 3 is started and a file control table 4 is used so that all the files dealt in a job processing 2 are copied from the normal file to the fault file and restored to the duplexing file. When the job processing 2 requests the input/output of the file during file restoration, the file input/output processing 3 executes reading from the normal file at the time of input request and executes writing in the 1-system disk file 5 and 2-system disk file 6 at the time of output request.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplicated file recovery system.

[0002]

2. Description of the Related Art Conventionally, in a file duplication system, when one of the files becomes a failure, it is necessary to stop the system and perform the restoration to restore the duplication file.

[0003]

In this conventional duplex file recovery method, when one file fails in the system, it is necessary to put the system into a maintenance state in order to recover that file. There was a problem that I had to stop. Also, if the file size is large, it takes a lot of time to recover, which hinders business.

[0004]

A duplicated file recovery system of the present invention is a file management table storing a correspondence table of 1-system file names and 2-system file names for all files handled by a business, and a file management table in the system. The file management table has business processing for handling business and file input / output processing for inputting / outputting and copying files, and the file input / output processing is performed when the failure of the 2nd system file is repaired and incorporated into the system. According to the above, records are written from the 1st system file to the 2nd system file. At this time, if there is an input request from the business process, data is read from the 1st system file, and if there is an output request from the business process, the 1st system file and The feature is that the data is written in the 2 system file.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 shows a configuration example of an embodiment of the present invention, FIG. 2 shows a file copying method of the present invention, and FIG. 3 shows a configuration example of a file management table in the present invention.

Normally, in a file duplication system, when the data to be stored in the file occurs in the business process 2, the business data and the storage record position of the file are passed to the file input / output process 3 and a write request is issued. ..

In the file input / output processing 3, the business data is written to both the 1-system disk file 5 and the 2-system disk file 6 according to the instruction of the business processing 2. When necessary business data is generated in the business process 2, the file read position is passed to the file input / output process 3 to make a read request. In the file input / output processing 3, business data is read from the 1-system disk file 5 according to the instruction of the business processing 2 and passed to the business processing 2.

When the file duplication operation is performed,
When a failure occurs in the second system disk file 6, the business data is written or read only in the first system disk file 5, and the second system disk file 6 is separated from the system. In the following example, 2 system disk file 6
A description will be given of a process when the failure of the 2nd system disk file 6 is repaired after being disconnected from the system and the system is ready for incorporation into the system.

When a request for incorporating the second system disk file 6 is input from the console 1, the file input / output processing 3 is started. In the file input / output processing 3, all files managed by the file management table 4 are copied from the 1-system disk file 5 to the 2-system disk file 6. As shown in FIG. 2, the file management table 4 stores a 1-system disk file name and a 2-system disk file name for all files used in the business process 2.

As for copying, as shown in FIG. 3, the 1st system disk file name registered at the beginning of the file management table 4 is sequentially read from the first record, and the 2nd system disk file name is sequentially written from the first record. .. At this time, every time a certain number of records are copied, it is confirmed whether or not there is an input / output request for business data. If there is an input request, the business data is read from the 1-system disk file 5 and passed to the business process 2. If there is an output request, the business data is written to the 1st system disk file 5 and the 2nd system disk file 6, respectively. When the input / output of the business data is completed, the request is checked again, and if there is not, the copying from the 1-system disk file 5 to the 2-system disk file 6 is restarted.

In this way, when the copying to the final record is completed, the next files on the file management table 4 are copied one after another in the above manner, and when the copying of all the files is completed, the 1-system disk file 5 The 2nd system disk file 6 is made identical.

Moreover, since the business data is also written in the disk files of both systems during the copying, no contradiction occurs.

[0013]

As described above, according to the present invention, when the redundant disk is restored while the system is in operation, the system can be restored without stopping the system and without hindering the business.

[Brief description of drawings]

FIG. 1 shows an exemplary configuration of an embodiment of the present invention.

FIG. 2 shows a method of file copying.

FIG. 3 shows a configuration example of a file management table in the present invention.

[Explanation of symbols]

 1 Console 2 Business process 3 File input / output process 4 File management table 5 1-system disk file 6 2-system disk file

Claims (1)

[Claims] 1. For all files handled in business, 1
A file management table that stores a correspondence table between system file names and system 2 file names, business processing that handles business in the system, and file input / output processing that performs file input / output and copying. In the input / output processing, when the failure of the system 2 file is repaired and incorporated into the system, a record is written from the system 1 file to the system 2 file according to the file management table. A duplicated file recovery system characterized by reading data from the 1-system file and writing data to the 1-system file and the 2-system file when an output request is issued from the business process.