JPS61206047A - Back-up system for computer - Google Patents

Abstract

PURPOSE:To keep always mutually equally the contents of the auxiliary memory device of two computer systems by providing a serial transmitting line and a transmitting controller between two computer systems. CONSTITUTION:The data of the prescribed format are prepared, inputted from a CRT 3 by the dialog type and temporarily stored to a main memory device (MMU) 2 by the control of a CPU 1. Further, the division of the data is read, and the processings such as the new preparation, renewal or deletion of the file are executed in accordance with the division. Next, the inputted data are read from an MMU 2 and written through a transmitting controller 4, a serial transmitting line 8 and a transmitting controller 10 to a MMU 13. A CPU 9 writes the contents of an MMU 13 in an auxiliary memory device 11, and the processings such as the new preparation, the renewal and the deletion of the file are executed in accordance with the data division. Thus, the same data are stored at auxiliary memory devices 5 and 11, the trouble occurs at the on-line side, and even then, change-over is executed to the back-up side by the operation of a change-over switch 16 and driving can be continued.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a computer backup system, and particularly to a computer system backup for controlling a public gazette video display system. - [Prior Art] Figure 4 is a block diagram showing a conventional device. Main memory mC and below MMU,! : Abbreviation f), +3)
, (14) An input device (hereinafter abbreviated as CRT), each of which has a cathode ray tube display m forming a man-machine interface and is capable of interactive input;
), (12) Vi transmission controller, (
7) and (15) are signal buses, (23) and (
24) are auxiliary storage devices, (23a) and (24a), respectively.
) are the replaceable storage media in the auxiliary storage device (23) and (24), respectively, i.e., the friend is a floppy disk 61, and the auxiliary storage device (23),
(24) is called a replaceable auxiliary storage device.

(1) to (7) and (23) constitute a first computer system (27), and (9) to (15) and (24)
The second computer system (28) is configured. Also, (16) is a changeover switch, (17) is a signal converter, (18) f'i display device, (19), (2o)
, (21) are serial signal lines, (22
) is the video element control line.

Next, the operation will be explained. Computer system (2
7) and ('1B) are configured in the same way and can operate in the same way, but during normal operation, one operates as online and the other as standby (5tandbY). Computer system (27) is online,
The following explanation will be given assuming that the computer system (2B) is on standby.

Data to be displayed on the display device (18) is input from the CRT (3), temporarily stored in the MMU (2) under the control of the CPU (1), and then stored in the MMU (2) under the control of the CPU (1).
The contents of (2) are replaceable auxiliary memory bags! (23).

The data stored in the exchangeable auxiliary storage device (23) is read out by the control eC of the CPU (11), which is executed according to commands input from the transmission controller (6) and the serial signal line (19). )
, (21) t i and sent to the signal converter (17). The display device (18) has an array of video elements such as light emitting diodes or lamps, and if a dot pattern of letters, symbols, etc. is displayed depending on which video element is lit, it is possible to replace the display device (18). Formula auxiliary storage device (23)
The signal read out from the serial signal line (21) and sent to the serial signal line (21) is a character code representing a character, symbol, etc., and the dot pattern of the character, symbol, etc. is stored in the signal converter (17) using the character code as an address. According to the character code input from the serial number 1g line (21), the dot pattern of the relevant character, symbol, etc. is output to the video element control line (22), and the dot pattern is displayed on the display device (18). Characters, symbols, etc. are displayed in the form of .

By the way, when a problem occurs in the computer system (27), the selector switch (16) is operated and the serial signal lines (20), (21) are switched. Same information as connected computer system (28) online? :
In this case, if the same information is not stored in the replaceable auxiliary storage device t (24), the information is displayed on the display device (18).
A storage medium that can be read up to that point (23
a) is removed and installed in the auxiliary storage device (24), and operation continues.

[Problem that the invention seeks to solve]

Since the conventional device is configured as described above, the exchangeable auxiliary storage devices t(23), (24) are used when creating data.
It has been necessary to store the same data in each storage medium, or to move a replaceable storage medium at the time of switching the changeover switch (16). Furthermore, there is a problem in that it is not easy to transfer data created on the standby computer system to the online computer system.

In addition, replaceable auxiliary storage devices have the following six problems: they have a complicated mechanism, small capacity, low speed, and low reliability.

This invention was made to solve the above-mentioned problems, and it is possible to use a fixed auxiliary storage device with large capacity, high speed, and high reliability, and it is possible to display images on an online computer system. Data can be created on the standby computer system while the system is running, and the created data can be used as is for video display.Furthermore, even if a problem occurs with the online computer system, the input terminal can be changed by operating a switch. It is just aimed at getting a computer backup system that does not require any other special operations.

[Means for solving problems]

In this invention, a serial transmission line is provided between two computer systems, and each computer system transfers the contents of its own main memory to the other party via the serial transmission line, and from the other party to the serial transmission line. The contents of the auxiliary storage devices of the two computer systems are always kept the same by providing a transmission controller that controls the input of the contents of the main storage device of the other computer system transferred via the computer system into its own main storage device. I made it.

[Effect]

In this invention, display data input from one computer system is stored in the main storage device of that computer system and then stored in the auxiliary storage device of the computer system, and at the same time, the display data is sent via the serial transmission line by the transmission controller. It is sent to the other party's transmission controller and also stored in the auxiliary storage device of the other party's computer system.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and the same reference numerals as in FIG. 4 indicate the same or corresponding parts, [4
1 and (10) are respectively referred to as first transmission controllers, while +61 and (12) i are respectively referred to as second transmission controllers. 15) and (11) are auxiliary storage devices, respectively, and (8) is a computer system (2
5) and (26) is a serial transmission line connected between them. (25) as the first computer system, (2
a) Let ' be the second computer system.

In FIG. 1, the parts having the same reference numerals as those in FIG. 4 operate in the same manner as explained in connection with FIG. 4, so a redundant explanation will be omitted.

FIG. 2 is a flowchart showing steps until input data is stored in the auxiliary storage device (abbreviated as disk in FIG. 2) (11) in the video display system shown in FIG. In Figure 2 (3
0) to (40) represent each step t''.

Figure 3 shows input from CRT (3) and CPU (1).
) (data that is input from the CRT (14) and temporarily stored in the CPU (9) is also the same);
In the figure, (50) represents the data length, (51) the data classification, (52) the file name, and (53) the areas in which nine data input from the CRT are stored. In the data division area (51), you can write new data to be stored in the data area (53) to the file specified by the contents of the file name area (52) (new creation), or
) is used to rewrite the data previously stored in the file (content update), or to erase the data previously stored in the file (erase). For example, create a new one.

Content update and deletion are represented by numbers 0 and 1.2, respectively.

Regarding Fig. 2, data in the format shown in Fig. 3 is created in steps (30) and (31), and the CRT (3
) is input in an interactive format and temporarily stored in the CPU (MMU 12 under the control of 11). Under the control of the CPU (1) immediately after, the data division of the data division area (51) is read in step (32), and according to the data division, the files specified in the file name area (52) are processed in steps (33) and ( 34).

Perform the process of (35), then move to step (36),
The data shown in FIG. 3 is read from the MMU (+2) and written to the MMU (13) via the transmission controller (4), the serial transmission line (8), and the transmission controller (10).

Next, in step (37), the contents of the MMU (13) are written into the auxiliary storage device (11) under the control of the transfer CPU (9). Steps (37), (3B), (39)
, (40) is the step (32), (33), (
a).

(35) is executed in the computer system (26). When the auxiliary storage device (11) is in a blank state and is in a writable state, steps (37) to (40) are executed after the auxiliary storage device (11) is in a writable state.

Similarly, when auxiliary storage device #(5) is in a write-disabled state, step (32) to
(35) ', and in this case, control may be performed so that step (36) is executed first.

As described above, the same data is stored in the auxiliary storage devices (5) and (11). CRT (14
The same applies to data input from ).

When the computer system (25) is online and the computer system (26) is in standby, the changeover switch (16) connects the serial signal lines (19), (2
1) is connected, and according to the command input from the CRT (3), the program in the 6 CPU [11] is activated, and the data of the specified next file in the auxiliary storage device (5) is read and transmitted. Controller (6) Serial signal line (19).

(21), the signal is converted into a video element control signal by a signal converter (17), and transmitted to a display device (18) for display.

If a problem occurs in the computer system (25), operate the selector switch (16) to switch the serial signal line (2
0) and (21), and connect the computer system (
26) is brought online and the video display device continues to operate according to commands from the CRT (14).

In the above embodiment, CRT +31, (1411&
:Although I used an input device, it is also possible to input using an input keyboard, tablet, or mouse. Also CRT
13).

(14) As a format for inputting i:, it is possible to use the format shown in FIG. 3 with the arrangement order changed or with other information added.

Furthermore, although the above embodiment describes the case of a computer system for displaying video, the same method as the above embodiment can be used for backing up other computer systems for data processing as long as the input data format is fixed. It has the effect of

〔Effect of the invention〕

As described above, according to the present invention, a backup system tm is created that can use an inexpensive, large-capacity, and highly reliable fixed auxiliary storage device. Even if there is a problem with the computer system on the online side, you can simply change the input to the signal converter by operating the changeover switch, and no other special operations are required. This has the advantage that it is possible to switch over to the backup computer system and continue operation in a short amount of time.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an embodiment of the present invention, Figure 2 is a block diagram showing an embodiment of the present invention.
1 is a flowchart showing the processing of input data in the device shown in FIG. 1, FIG. 3 is a format diagram showing the format of input data in the device shown in FIG. 1, and FIGS. 4A and 4B are block diagrams showing conventional devices. In the figure, +11 and +911fi respectively CPU
, +21, (13) are respectively MU, 13)
, (14) are respectively CRT and +41. (10) are the first transmission controller, +71 and (15
) are each a signal bus, (8) is a serial transmission line,
(16) is a signal switcher, (17) is a signal converter, (1
8) is a video display device, (19), (20), (
21) are serial signal lines, (22) are video element control lines, (25) are the first computer system, and (26) are the second computer system. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] It consists of a first computer system, a second computer system, and a serial transmission line provided between these two computer systems, and each computer system includes an auxiliary storage device that stores data in a predetermined format by dividing it into files. , the data in the above prescribed format along with the data length of the data, the file name in which the data should be stored, and the data classification indicating whether to create a new file, update its contents, or delete its contents. means for inputting data into a storage device;
The contents of the main memory are transferred to the other party's computer system via the serial transmission line, and the contents of the main memory of the other party's computer system are transferred from the other party's computer system to the other party's computer system via the serial transmission line. a first transmission controller that performs control for inputting the data into the main memory of its own computer system, and the content of the auxiliary storage for the file indicated by the file name according to the data classification of the main memory content; and a second controlling means for sending the contents of the auxiliary storage device to the serial signal line.
A computer backup system comprising: a transmission controller;