JPS6115227A - Data file backup method - Google Patents

Abstract

PURPOSE:To switch quickly and effectively an operation system file to a backup system file by informing a fault detected at the side of the normal operation system file through a state informing means to start the backup system file. CONSTITUTION:The write data fed from a processor 1 is written simultaneously in a normal operation system file unit 2 and a backup system file unit 3 with a multi-channel address. The data read out of both units 1 and 2 are sent only through the unit 2. When a fault detecting part 7 of the unit 2 detects a fault, a file unit control part 6 stops the transmission of data and at the same time informs the fault to the unit 3 through a status informing means (d). Receiving this information, a control part 6' of the unit 3 starts a data transmission control part 5 and extracts data out of a data file 9'. Thus the unit 3 transmits data continuously to the processor 1 via a bus interface part 4'.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data file backup method for a system in which a plurality of processing devices and a plurality of file devices are connected via a predetermined bus.

As a main device that makes up an information processing system.

There are file devices that store various types of information, and processing devices that control operations for storing information in the file device and retrieving stored information.

Since the information handled by an information processing system is required to be processed quickly and without errors, various functions are included in the system construction.

For example, if there is an abnormality in a predetermined file device that stores important information and the desired processing becomes impossible, it is necessary to perform some kind of backup processing immediately.

In recent years, as information processing technology has developed rapidly and information processing systems have become commonplace in various places, the backup processing described above has become more efficient.

Moreover, there has been a demand for a practical method for backing up data files that can be performed more quickly.

[Conventional technology]

A conventional data file backup method for a system comprising a processing device and a file device will be explained with reference to the drawings.

FIG. 2 shows a conventional data file backup method. ■～■ in the figure are file processing processes.

a and b indicate buses, respectively.

Conventionally, to realize backup of data files in a system having a file device.

There is a method shown in FIG. 2(A). In other words, after the normal work is completed (data writing operation process in ■) between processing device 1 and file device 2 (normal operation file device), which are normally connected by one bus a, the data processed that day is used in normal operation. Once downloaded from the system file device 2 by the processing device 1 (■
data reading operation process), the same bus a from the processing device l
The process of writing to the backup file device 3 connected to the computer was being performed (process (■)).

As a result of the above, 1. For example, if the normal operation file device 2 goes down, business processing is temporarily stopped.

After switching to the backup file device 3, it was possible to resume business processing.

In addition, the method shown in Fig. 2 CB) provides two bus systems a and b between the processing device 1 and the file device 2.3, and when one normal operation file device 2 goes down, one normal operation path is used. Switch from bus a to backup bus b and start business processing m
It continued.

Note that in the bus method, control information and data are sent and received using a signal bus (bus cable). That is.

This is a method in which the same bus cable is shared by several devices to exchange signals, and usually there is one device on the sending side and multiple devices on the receiving side.

Therefore, when sending signals using a bus cable,
In the conventional bus system, by assigning numbers to multiple devices on the receiving side and sending a signal by specifying 2 numbers, the signal can be received by the designated device.

[Problem that the invention seeks to solve]

However, in the method shown in FIG. 2(A), it takes time to download data to the backup file device 3, and the processing device 1 side also needs to be aware of the change.

Further, the method shown in FIG. 2(B) has the problem that the duplication of buses requires extra costs and requires time and effort for system maintenance.

[Means for solving problems]

The present invention aims to realize a new data file backup method that solves the above-mentioned problems. a first means for making the contents of the operational file and the backup file the same;

and a second means for mutually notifying the status of file processing, and when an abnormality is detected in the normal operation file, the second means notifies the user and starts the backup file. This problem is solved by the data file backup method.

[Effect]

That is, a specific bus method 1, for example, carrier sense multi-access/collision detection method (hereinafter referred to as C3MAZCD method), is used between the processing device and the file device, and writing to the file device is normally performed using a multiplex system, a back amplifier system, etc. Performs multicast address processing in which the same data is written to multiple file devices at the same time.

Also, data transmission when reading data from a file device is 1.
Normally, the data is sent from the operational file device, and when an error is detected, the normal operational file device notifies the backup file device directly, and the data continues to be sent from the backup file device without going through the processing device.

〔Example〕

The gist of the present invention will be specifically explained below with reference to an embodiment shown in FIG.

FIG. 1 shows an embodiment of the data file backup method according to the present invention, in which (A) is a data flow diagram when writing data, (B) is a data flow diagram when reading data,
(C) shows a block diagram of the file device.

In the figure, ■ indicates write dark, ■ indicates read data command, ■ indicates read data, and C indicates CS? I to/CD type bus, and d indicate status notification means, respectively. Also, the same symbols indicate the same objects or contents throughout the figures. Note that the numbers 4 to 9 indicate the respective devices in the normal operation system, and the numbers 4' to 9' indicate the same devices in the backup system.

The HAS method of C3MA/CD is a method in which multiple devices simultaneously receive the same signal, and if there is a signal collision during signal transmission, signal transmission is stopped and signal transmission is resumed after a certain period of time.

That is, when data is written in a system such as that shown in FIG. The same data is written to simultaneously.

FIG. 1(C) I. In the normal operation file device W2 shown in FIG.
Send to. The file device control section 6 determines that the received data is data to be written into the data file 9, sends the data to the data write control section 8, and writes the data into the data file 9. Incidentally, this operation is also performed in the backup system file device 3 in the same way.

Next, when reading data from file devices 2 and 3, the read data command ■ from the processing device 1 is normally sent to the operational file device 2 and the backup file device 3 using the multicast address, but the read data command ■ is normally sent to the operational file device 2 and the backup file device 3. It is sent only to the active file device 2.

That is, in the normal operation file device 2, the file device control section 6 controls the data transmission control section 5.

Data is extracted from the data file 9 and sent via the hash interface section 4. During this time, the file device control section 6 collates the retrieved data with the abnormality detection section 7 to check for the presence or absence of two abnormalities.

At this time, only the data sending control section 5 of the normal operation file device 2 is controlled, and the data sending control section 5' of the backup file device 3 is not controlled and stopped.

If an abnormality is detected by the abnormality detection unit 7 of the file device 2 for normal operation 9 during the above operation, the file device control unit 6 of the file device 2 for normal operation 9 stops data transmission and hacks via the status notification means d. The upload system file device 3 is notified of abnormality detection.

Upon receiving the abnormality detection notification, the file device control unit 6' of the backup file device 3 activates the data transmission control unit 5', and the data file 9 of the hackup file device 3 is activated.
Extract data from '.

Data is continuously sent to the processing device 1 via the bus interface section 4'.

〔Effect of the invention〕

According to the present invention as described above, there is no need to provide a separate time for writing data to the backup file device, and when an abnormality occurs in the normal operation file device, switching to the hack-up file device can be quickly performed. , and has the effect of being able to perform it efficiently.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a data file hackup method according to the present invention. Figure 2 shows the conventional data file hackup method. are shown respectively. In fig. 1 is a processing device. 2 is a normal operation file device. 3 is a hack-up file device. 4 is the bus interfunis club. 5 is a data sending control section, 6 is a file g open control section 7 is an abnormality detection section, 8 is a data writing control section 9 is a data file. are shown respectively. Stem IJ (A) □ Rod, 1 River

Claims (1)

[Claims] In a system in which a plurality of processing devices and a plurality of file devices are connected by a bus, the plurality of file devices are configured as a normal operation system and a backup system, and the contents of the normal operation system file and the contents of the backup system file are different from each other. and a second means for notifying each other of file processing status, and when an abnormality is detected in the normal operation file, the second means notifies the user of the same content. A data file backup method characterized in that the backup system file is activated.