JPH0614331B2 - Online processing system switching method for multiple computer systems - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a system in which an online processing system is present in a plurality of computer systems, in the case where one computer system among the plurality of computer systems is stopped due to a failure.
The present invention relates to an online processing switching method in a multiple computer system that switches to another computer system and continues processing.

[Conventional technology]

Conventionally, the following four methods have been adopted as the online processing switching method in this type of multiple computer system.

The first is a method in which when one computer system among a plurality of computer systems fails and stops, the network line is switched and at the same time resources such as a database used for online processing are also switched.

An example of this first method will be described with reference to FIG. The computer system 1A is an operating computer system, and the computer system 1B is a computer system that can take over the processing of the computer system 1A when the computer system 1A fails and stops. In this case, the terminal device 12A and the database 4 are connected to the computer system 1A. When the computer system 1A is stopped due to a failure, the line switching device 15 connects the terminal device 12A to the computer system 1B. The database 14 is also loaded into the computer system 1B. After that, the input message input from the terminal device 12A is processed by the computer system 1B.

The second method is a method in which the input message is stored in a file or the like in the secondary storage medium, the message therein is taken over, the message is input and processed, and then the network is switched.

An example of this second method will be described with reference to FIG. The computer system 1A is an operating computer system, and the computer system 1B is a computer system that can take over the processing of the computer system 1A when the computer system 1A fails and stops. In this case, the terminal device 12A is connected to the computer system 1A by the line switching device 11A.
The input message processed by the computer system 1A is stored in the secondary storage medium 16. When the computer system 11A is stopped due to a failure, the secondary storage medium 16 is connected to the computer system 1B and the input message is transmitted to the computer system 1B.
Input to and process. Next, the line switching device 11A connects the terminal device 12A to the computer system 1B. After that, the input message input from the terminal device 3A is processed by the computer system 1B.

The third method is a method of transmitting the same message to a plurality of computer systems and simultaneously performing parallel processing.

An embodiment of the third method will be described with reference to FIG. In this method, an input message input from the terminal device 12A is notified to the computer system 1A and the computer system 1B, and online processing is performed in each computer system. In this case, even if the computer system 1A is stopped due to a failure, the online processing is continued because the computer system 1B is operating normally.

The fourth method is a method having an area for storing an input message for each computer system.

An example of the fourth method will be described with reference to FIG.
The computer system 1A is an operating computer system, and the computer system 1B is a computer system that can take over the processing of the computer system 1A when the computer system 1A fails and stops. In this method, an input message input from the terminal device 12A is processed by the computer system 1A and stored in the secondary storage medium 16B connected to the computer system 1B. When the computer system 1A is in a failure stop state, the operator indicates that the computer system 1A is in a failure stop state.
Is notified, the stored input message is read, and message processing is performed. After that, the line switching device 11A
Then, the terminal device 12A is reconnected to the computer system 1B and the online processing is continued.

[Problems to be solved by the invention]

In the first method among the online processing switching methods in the multiple computer system described above, the multiple computer systems must access resources such as the same database, so that the multiple computer systems must be physically close to each other. There is.

Even in the second method, since the multiple computer systems must access the files in the same secondary storage medium,
The disadvantage is that multiple computer systems must be physically close together.

In the third method, since multiple computer systems perform parallel processing at the same time, the online processing can be switched immediately when a failure occurs in one computer system. Only one online process is sufficient, and there is a drawback that the operation efficiency in a multi-computer system decreases.

The fourth method solves the problem that the multiple computer systems, which are the drawbacks of the first and second methods, must be physically close to each other, but the operator continues the online stop of the online processing computer system. Disadvantage that the computer system capable of processing is notified, the input message stored in the secondary storage medium is processed as a message, and then the operator has to reconnect the terminal device to the computer system capable of continuing online processing by the line switching device. There is.

[Means for solving problems]

The online processing switching method in a multiple computer system of the present invention is a message input / output unit in which a terminal device is connected to a plurality of computer systems via a line switching device and a message is exchanged with the terminal device. An online processing system having a message processing unit for processing a message transmitted / received by an input / output unit, wherein an input message input from the message input / output unit is transmitted to a message to be processed in the computer system and another computer system. Input message branching means for branching to the message, input message sending means for sending the message branched by the input message branching means to another computer system, and an input message sent from the other computer system for the computer system Recipient to receive in Message storage means for storing the input message received by the receiving means, and when one computer system of the plurality of computer systems is in a failure stop state, the processing performed by the computer system is executed. Monitoring means for monitoring the operating state of the computer system so that it can be taken over by the other computer system, and in order to process the input message stored in the message storing means online in response to the failure notification from the monitoring means. Requests the line switching device to reconnect the storage message reading means for reading the input message and the terminal device connected to the computer system in which the failure has stopped to the computer system that can take over the processing of the computer system in which the failure has stopped. And line switching request means.

〔Example〕

 The present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, one embodiment of the present invention comprises computer systems 1A and 1B on a network, line switching devices 11A and 11B, and terminal devices 12A and 12B. The computer system 1A has therein a message processing means 2A, a stored message reading means 3A, an input message branching means 4A, an input message transmitting means 5A, a monitoring means 6A, and a message storage area 7.
A, input message storing means 8A, other system input message receiving means 9A, message input / output means 10A, and line switching requesting means 13A. Further, the computer system 1B has therein a message processing means 2B, a stored message reading means 3B, an input message branching means 4B, an input message transmitting means 5B, a monitoring means 6B, a message storage area 7B, an input message storage means 8B, and another system. It includes an input message receiving means 9B, a message input / output means 10B, and a line switching requesting means 13B.

In the following example, the computer system 1A is the operating computer system, and the computer system 1B is the computer system 1
When A becomes a failure stop state, the message processing means 2
Another computer system that can take over the processing that was being processed by A, and the computer system 1A that was processing the message is stopped due to a failure, and the input message processed by the message processing means 2A is sent to the message processing means 2B in the computer system 1B. As an example, it is possible to input, perform message processing, and continue message processing.

First, an embodiment of another computer system prepared so that the processing of the operating computer system and the operating computer system of the present invention can be taken over will be described.

Referring to FIGS. 1 and 2, the input message determined to be input from the terminal device 12A in step 21 is sent to the input message branching means 4A via the line switching device 11A and the message input / output means 10A. Referring to FIGS. 1 and 3 notified at 24, the input message branching means 4A notifies the message processing means 2A in step 31 to perform message processing in response to the input message, and Step 3 in the input message sending means 5A for sending to the computer system 1B
Notify the input message with 2.

The message processing means 2A processes the input message, notifies the output message to the message input / output means 10A, and further notifies the terminal device 12A via the line switching device 11A.

Referring to FIG. 1 and FIG. 4, the input message transmitting means 5A notifies the other system input message receiving means 9B in the computer system 1B in response to the input message from the input message branching means 4A, and inputs the other system input message. The receiving means 9B further notifies the input message to the input message storing means 8B in step 41.

When the computer system 1A is in a failure stop state, the input message storage means 8B inputs the input message processed by the computer system 1A to the message processing means 2B in the computer system 1B so that the message can be processed in step 42. Is stored in the message storage area 7B.

Referring to FIGS. 1 and 5, the monitoring means 6A sends a health check signal to the computer system 1B at regular intervals. The computer system 1B is monitoring the signal by the monitoring means 6B, and if the signal does not arrive even after a certain period of time, the failure of the computer system 1A can be detected in step 51.

Next, when the operating computer system of the present invention is stopped due to a failure, another computer system that is prepared to take over the processing of the operating computer system is switched to the operating system and An example will be described.

The monitoring means 6B monitors the state of the computer system 1A in step 51, and when the computer system 1A is in the failure stop state, the stored message reading means 3B in step 52.
Is notified that the computer system 1A has stopped due to a failure.

Referring to FIGS. 1 and 6, the stored message reading means 3B reads the input message stored in the message storage area 7B in step 62, and notifies the message processing means 2B in step 63 to process the message.

When all the input messages have been processed in step 64, the stored message reading means 3B notifies the line switching request means 13B that all the input messages stored in the message storage area 7B in step 65 have been processed.

The line switching requesting means 13B includes the line switching device 11
A request for switching the terminal device 12A is issued to A, and the line switching device 11A reconnects the terminal device 12A to the computer system 1B.

An input message input from the terminal device 12A connected to the computer system 1B is processed by the message processing means 2B via the line switching device 11A, the message input / output means 10B, and the input message branching means 4B. Further, the output message is message input / output means 10B and line switching device 11A.
It is returned to the terminal device 12A via.

〔The invention's effect〕

According to the present invention, a multi-computer system has a storage area for input messages, the input messages that have been processed online are stored on another computer system, and the mutual outages are monitored to allow the multi-computer system to exist at a remote location. Even if it is possible to switch online processing,
Further, there is an effect that the online processing system switching processing can be automatically performed without human intervention.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of the message input / output means 10A of FIG. 1, and FIG. 3 is a configuration of the input message branching means 4A of FIG. 4 is a diagram showing the configuration of the input message storage means 8B of FIG. 1, FIG. 5 is a diagram showing the configuration of the monitoring means 6B of FIG. 1, and FIG. 6 is a storage of FIG. FIG. 7, FIG. 8, FIG. 9, FIG. 9 and FIG. 10 showing the structure of the message reading means 3B are diagrams showing an example of the prior art. 1 to 10, 1A, 1B ... Computer system, 2A, 2B ... Message processing means, 3A, 3B ... Stored message reading means, 4A, 4B ... Input message branching means, 5A,
5B: input message sending means, 6A, 6B ... monitoring means, 7A, 7B ... message storage area, 8A, 8B ...
Input message recording means, 9A, 9B ... Other system input message receiving means, 10A, 10B ... Message input / output means, 11A, 11B, 15 ... Line switching device, 12A, 12B ... Terminal device, 13A, 13B
...... Line switching request means, 14 …… Database,
16, 16A, 16B ... Secondary storage medium.

Claims (1)

[Claims] 1. A terminal device is connected to a plurality of computer systems via a line switching device, and a message input / output means for exchanging messages with the terminal device and a message exchanged by the message input / output means are provided. In an online processing system having a message processing means for processing, an input message branching means for branching an input message inputted from the message input / output means into a message to be processed in the computer system and a message to be transmitted to another computer system. An input message transmitting means for transmitting the message branched by the message branching means to another computer system; a receiving means for receiving the input message transmitted from the other computer system in the computer system; Remember the input message received by Message storage means for storing the information, and operation of the computer system so that when one computer system of the plurality of computer systems is in a failure stop state, the process being processed by the computer system can be taken over by another computer system. Monitoring means for monitoring the state, and memory message reading means for reading the input message for online processing of the input message stored in the message storage means in response to the failure notification from the monitoring means; A plurality of computers comprising: a line switching requesting means for requesting the line switching device to reconnect the terminal device connected to the computer system to the computer system that can take over the processing of the computer system in which the failure has occurred. Online processing system switching method in the system.