JPH0465733A - System for forming backup file - Google Patents

Abstract

PURPOSE:To improve the utilization efficiency of a computer system resource by forming a backup file in parallel with operation processing without aborting an operation program. CONSTITUTION:A copying processing part 3 is started without interrupting the execution of the operation program 1 based upon an instruction of an operation management part 2 and the contents of a filing device 5 is copied to a backup filing device 6. During the period of the copying, a write monitoring part 4 monitors the writing of the program 1 in the device 5, and at the time of detecting the writing in a copied area of the device 5, updates the device 6 in accordance with the contents of the writing. Consequently, a backup file can be formed without interrupting data processing based upon the operation program and the utilization efficiency of the computer system resource can be improved.

Description

[Detailed Description of the Invention] [Summary] This invention aims to improve the efficiency of using computer system resources by making it possible to create a backup file without interrupting data processing by a business program with respect to a backup file creation method. In a computer system that performs transaction processing using a file device, a business program, an operation management section, a copy processing section, a write monitoring section, a file device,
The operation management section specifies the file device to be backed up and the backup file device that stores the contents of the file device for bank up, and sends the backup to the copy processing section and the write monitoring section. Instructing the start of file creation, the copy processing unit copies the contents of the file device to the backup file device based on the instruction, and notifies the operation management unit of the end of the copy,
The write monitoring unit monitors the writing of the business program to the file device based on the instruction, and when detecting writing to the copied area of the file device, updates the backup file device according to the contents of the writing. The operation management section continues until it receives a backup completion notification from the management department. Based on the copy completion notification from the copy processing department, the operation management department suppresses the start of new business programs, waits for the existing business program to finish, and then resumes write monitoring. The configuration is configured so that the backup is completed.

[Industrial application field]

The present invention relates to a backup file creation method in a computer system that performs transaction processing using a file device.

As the amount of data processed by computer systems increases with the development of an advanced information society, and as the capacity of direct access storage devices used in computer systems increases, it is becoming increasingly important to efficiently create backup files for direct access storage devices. It is requested.

To improve the usage efficiency of computer system resources by creating backup files in parallel with business processing without using a computer system exclusively for creating backup files.

[Conventional technology]

FIG. 7 is a conventional system configuration diagram.

Creation of a backup file is started by waiting for the completion of processing of the business program 71 and activating the copy processing section 73. The copy processing unit 73 copies the contents of the file device 75 to the backup file device 76. If the business program 71 is started during the copying, the file device 750 will be updated and the contents of the file device 75 and the backup file device 76 will become inconsistent, so the execution of the business program 71 will be stopped and the corresponding file device 75 will be updated. The main storage device (memory space where programs execute) 77, which performs the copying, is therefore exclusively used by the copying processing section 73, resulting in a reduction in the efficiency of use of computer system resources during the copying process.

[Problem to be solved by the invention]

In a computer system that uses a large-capacity file device, the creation of a backup file is performed exclusively on the computer system, so other business processes are interrupted while the backup file is being created, resulting in an efficient use of computer system resources. There was a problem with decline.

An object of the present invention is to improve the efficiency of using computer system resources by making it possible to create a backup file without interrupting data processing by a business program.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

The figure is a configuration diagram of a backup file creation method. In a computer system that performs transaction processing using a file device, a business program 1, an operation management section 2, a copy processing section 3, and a write monitoring section are used. 4, a file device 5, and a backup file device 6, and the operation management unit 2 specifies the file device 5 to be backed up and the backup file device 6 that stores the contents of the file device 5 for backup. , instructs the copy processing unit 3 and the write monitoring unit 4 to start creating a backup file, and the copy processing unit 3, based on the instructions,
The contents of the file are copied to the backup file device 6, the operation management section 2 is notified of the completion of the copying, and the write monitoring section 4,
Based on the instructions, operation management monitors the writing of the business program l to the file device 5, and when writing to the copied area of the file device 5 is detected, updates the backup file device 6 according to the content of the writing. Based on the copy completion notification from the copy processing unit 3, the operation management unit 2 suppresses new startup of the business program 1 and waits for the existing business program 1 to finish. Then, the write monitoring unit 4 is notified of the completion of the backup.

[For production]

According to this method, the copy processing unit 3 is activated without interrupting the execution of the business program 1, and copying from the file device 5 to the backup file device 6 is performed. During the copying, the write monitoring unit 4 monitors the write request of the business program 1 to the file device 5, and if the write request to the file device 5 is to update the content of the copied area 51, the write monitoring unit 4 updates the content to the backup file device 6. By also reflecting the same on both file devices, the identity of both file devices is guaranteed.

〔Example〕

FIG. 2 is a system configuration diagram of the embodiment.

FIG. 3 shows the operation management unit processing procedure of the embodiment.

In order to create a backup file, in processing step 81, the file device 5 to be backed up,
The backup file device 6 that copies the contents of the file device 5 is designated by the input/output device 21, and the operation management section 2 is activated.

In processing step 82, the operation management section 2 registers the ID (identification information) of the file device in the area management table 22, sets a backup file creation flag, and starts the copy processing section 3 and the write monitoring section 4.

In processing step 83, the operation management section 2 waits for the copy processing section 3 to complete copying.

FIG. 4 shows the processing procedure of the copy processing section of the embodiment.

In a processing step 31, the copy processing unit 3 starts copying the contents of the file device 5 to the backup file device 6 in predetermined copy units 53 from the top address of the file device 5. In processing step 32, when the copying of the copy unit 53 is completed, in processing step 33, the final address ai (i=1 to n) that has been copied is registered in the area management table 22 as a copied address. FIG. 2 shows that the final address at when copying has proceeded to the copied area 51 has been registered in the management table 22.

FIG. 6 shows an explanatory diagram of the area management table.

In FIG. 4, the copy processing unit 3 performs the following steps in processing step 34:
The copied address is checked, and if the address matches the final address of the file device 5, it is assumed that the copying of the entire area of the file device 5 has been completed, and in processing step 36, the operation management section 2 is notified and the copying process is ended. . If an uncopied area remains, the area corresponding to the next copy unit is copied in processing step 35.

FIG. 5 shows the write monitoring unit processing procedure of the embodiment. When the write monitoring unit 4 is activated, it accepts a write request issued by the business program 1 to the file device 5 in a processing step 41, and checks whether the write request is written into the copied area 51 in a processing step 42. The write request is checked by referring to the copied address registered in the area management table 22, and whether the write request is
In the case of writing to, in processing step 43, writing is performed to the corresponding area 62 of the backup file device 6. If the write request is for writing to an area other than the copied area (uncopied area), writing to the backup file device 6 is not performed. The determination of writing in processing step 42 and the processing of updating the contents of the copied area in processing step 43 ensure the sameness of the contents of both file devices.

When the operation management unit 2 receives the notification of the completion of copying in processing step 84 in FIG. 3, in processing step 85 it temporarily suppresses the generation of a new business program
Wait for the processing to finish.

The business program 1 ends the process (processing step 8
6) In processing step 87, the write monitoring unit 4 is stopped, a message indicating completion of backup file creation is output to the input/output device 21, the file device ID is deleted from the area management table 22, and the backup file creation flag is set. Delete it and cancel the suppression of business program generation.

〔Effect of the invention〕

The present invention improves the efficiency of using computer system resources by creating backup files in parallel with business processing without stopping business programs in a computer system that uses a file device to perform transaction processing. Be expected.

FIG. 2 is a system configuration diagram of the embodiment, FIG. 3 is the operation management section processing procedure of the embodiment, FIG. 4 is the copy processing section processing procedure of the embodiment, and FIG. 5 is the write monitoring section processing procedure of the embodiment. FIG. 6 is an explanatory diagram of an area management table, and FIG. 7 is a diagram of a conventional system configuration.

In the figure, 1.71 is a business program, 2 is an operation management section, 21 is an input/output device, 22 is an area management table, 3.73 is a copy processing section, 4 is a write monitoring section, 5.75 is a file device, 51 is the copied area, 52 and 62 are the areas, 53 is the copy unit, 6.76 is the backup file device/77
indicates a main storage device, 31 to 36, 41 to 44, and 81 to 87 indicate processing steps.

[Brief explanation of drawings] Figure 1 is a block diagram of the principle of the present invention. Principle block diagram of the present invention Figure 1 Example system configuration diagram Figure 2 start end Operation management unit processing procedure of example Figure 3 start end Completed Example write monitoring unit processing procedure Figure 5 Figure 6 start end Completed Example copy processing unit processing procedure Figure 4 Conventional system configuration diagram Figure 7

Claims (1)

[Claims] A computer system that performs transaction processing using a file device includes a business program (1), an operation management section (2), a copy processing section (3), and a write monitoring section (4). ) and the file device (
5) and a backup file device (6), the operation management unit (2) includes a file device (5) to be backed up and a backup file device that stores the contents of the file device (5) for backup. (6), and instructs the copy processing unit (3) and write monitoring unit (4) to start creating a backup file. Based on the instruction, the copy processing unit (3)
Copy the contents of 5) to the backup file device (6), notify the operation management department (2) of the completion of the copy, and write monitoring department (4), based on the instructions, copy the contents of the business program (1). The operations management department (2) monitors writing to the file device (5), and when it detects writing to the copied area of the file device (5), instructs the operation management department (2) to update the backup file device (6) according to the content of the writing. ), and based on the copy completion notification from the copy processing unit (3), the operation management department (2) prevents new startup of the business program (1) and restarts the existing business program. A backup file creation method characterized in that, after waiting for the completion of step (1), a write monitoring unit (4) is notified of the end of the backup.