JPH09200811A - Fault recovery method and its system in multi-processor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the effect by a fault while the fault caused in a communication control module controlling communication of terminal equipments is restored and to recover the fault quickly SOLUTION: In the multi-processor system where communication control modules 13, 14, a system control module 12 and a fault recovery module 11 are connected by a system bus 10, the system control module 12 detecting the fault of the communication control module 14 requests substitution of processing to the communication control module 13 being a substitute module for communication with a terminal equipment according to a priority given in advance by a communication substitute command section 121.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for coping with a communication failure in a multiprocessor system,
In particular, the present invention relates to a failure recovery method and system using a processor that acts as a substitute when a communication failure occurs.

[0002]

2. Description of the Related Art A conventional technique will be described.

FIG. 3 is a block diagram showing an embodiment of a conventional multiprocessor system. As shown in the figure, the conventional multiprocessor system includes a plurality of communication control modules 33, 34 for controlling communication of terminals (not shown).
And a system control module 32 for individually instructing failure monitoring processing and communication control of each communication control module 33, 34, and a failure recovery module 31 for performing failure recovery processing of each communication control module 33, 34 in one system. It is connected to the bus 30. Here, the module means one system in which software functions are implemented on hardware. Therefore, the communication control module is a system having a control function of communication with the terminal,
The system control module is a system having a function of performing failure monitoring processing and communication control instruction of each communication control module, and the failure recovery module is a system having a function of performing failure recovery processing of each communication control module. These three types of modules are connected by the system bus in the same exchange.

Next, a processing procedure when a failure occurs will be described.

FIG. 4 is a diagram showing a processing sequence for failure recovery according to the prior art. As shown in FIG. 4, the system control module 32 controls the communication terminal at each communication occurrence (irregular) at a communication control module 34.
To the communication control instruction signal 21. In addition, the system control module 32 uses the communication control modules 33, 3
4, the fault monitoring notification signals 24 and 22 are transmitted in a constant cycle. When the communication control modules 33 and 34 receive the failure monitoring notification signals 24 and 22, they return failure monitoring response signals 25 and 23 to the system control module 32.
Communication control instruction signal 21 and failure monitoring notification signals 22, 24,
It is an independent signal that is not directly related to the fault monitoring response signals 23 and 25. In this way, the system control module 32 monitors the failure of the communication control modules 33 and 34 at any time.

Now, for example, when a failure occurs in the communication control module 34, the communication of the terminal controlled by the communication control module 34 is disabled, and the failure monitoring response signal 23 is not returned to the system control module 32. When such a situation occurs, the system control module 32 considers that a failure has occurred in the communication control module 34, and in order to recover from the failure, the failure recovery module 31
A failure recovery instruction signal 26 is transmitted to the. The failure recovery module 31 automatically performs failure recovery processing of the communication control module 34 that has failed. After the failure recovery, the system control module 32 transmits the communication control instruction signal 21 to the communication control module 34 that controls the communicating terminal, and the communication with the terminal is restored.

[0007]

In the conventional failure recovery method for a multiprocessor system as described above, a terminal controlled by a communication control module in which a failure has occurred is communicated until the failure is recovered. Will not be possible and will have a great impact on the user of the terminal.

An object of the present invention is to provide a multiprocessor which, even if a failure occurs in one communication control module, minimizes the influence on the user and enables quick recovery of communication with a terminal after the occurrence of the failure. It is to provide a system failure recovery method.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a system control module which has detected a failure of a communication control module has its communication controlled by the failed communication control module. The terminal control is delegated to another communication control module according to the priority order registered in advance in the system control module for each terminal, enabling the terminal control before the failure communication control module is restored, A failure recovery method and system in a multiprocessor system for recovering a communication failure.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a multiprocessor system according to an embodiment of the present invention. The multiprocessor system of FIG. 1 includes communication control modules 13 and 14 for controlling communication of terminals (not shown) and each communication control module 1.
The system control module 12 for instructing the monitoring processing of the failures occurring in 3 and 14 and the communication control and communication proxy, and the failure recovery module 11 for automatically performing the failure recovery processing of the respective communication control modules 13 and 14 It is configured by being connected by the system bus 10. The system control module 12 of the present invention is provided with a communication proxy instruction unit 121 for instructing communication proxy, and the system control module 1
When 2 detects a failure of the communication control module, the communication substitution instruction unit 121 requests another communication control module to substitute for communication in accordance with the registration priority order. Although not shown, each terminal belongs to each communication control module in multiple. As a result, the failure recovery method by the processing proxy processor for communication in the multiprocessor system of the present invention is realized.

Next, a processing procedure when a failure occurs will be described. FIG. 2 is a processing sequence showing a failure recovery method for a multiprocessor system according to an embodiment of the present invention.

As shown in FIG. 2, the system control module 12 sends a communication control instruction signal 21 to the communication control module 14 that controls the terminal with which it communicates, at each occurrence of communication (irregularly). , Control the terminal. The system control module 12 is each communication control module 1
Failure monitoring notification signals 24 and 2 to 3 and 14, respectively.
2 is transmitted at a constant cycle, and each communication control module 1
When receiving the fault monitoring notification signals 24 and 22, the systems 3 and 14 send fault monitoring response signals 25 and 23 to the system control module 1
Reply to 2. Communication control instruction signal and fault monitoring notification signal,
It is an independent signal that is not directly related to the fault monitoring response signal.

Now, when a failure occurs in the communication control module 14, the terminal controlled by the communication control module 14 becomes unable to communicate, and a failure monitoring response signal to the failure monitoring notification signal 22 from the system control module 12 is sent. 23 will not be returned. After a certain period of time without a response signal, the system control module 12 detects that the communication control module 14 has a failure.

The system control module 12, which has detected that the communication control module 14 has a failure, sends a failure recovery instruction signal 26 to the failure recovery module 11 to automatically perform the failure recovery processing of the communication control module 14. Encourage them to do so. In addition, the system control module 1
The communication control module 2 transmits a communication control proxy instruction signal 27 to the communication control module 13 that will proxy the control according to the priority given to the communication proxy instruction unit 121 for the terminals that cannot communicate. The control of the terminal controlled by 14 is performed on behalf of the terminal to enable communication with the terminal.

After that, when the failure of the communication control module 14 is restored, the system control module 12 directly controls the communication under the control of the communication control module 13 by the communication control module 13, but newly. Regarding the generated communication, the system control module 12 transmits the communication control instruction signal 28 to the communication control module 14 according to the priority of each terminal, and the communication control module 14 is caused to control the communication.

[0017]

As described above, according to the present invention,
Since each terminal controlled by the communication control module belongs to multiple communication control modules, if a failure occurs in one communication control module, it will be different according to the priority that the system control module has in advance. Since the communication control module of (1) substitutes the control of the terminal, there is an effect that communication of the terminal due to a failure becomes impossible and the failure recovery of the communication can be promptly performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a multiprocessor system according to the present invention.

FIG. 2 is a processing sequence diagram showing an embodiment of a failure recovery method for a multiprocessor system according to the present invention.

FIG. 3 is a configuration diagram showing an embodiment of a conventional multiprocessor system.

FIG. 4 is a processing sequence diagram showing an embodiment of a conventional fault recovery method for a multiprocessor system.

[Explanation of symbols]

 10 system bus 11 failure recovery module 12 system control module 13 and 14 communication control module 21 communication control instruction signal 22 and 24 failure monitoring notification signal 23 and 25 failure monitoring response signal 26 failure recovery instruction signal 27 communication control substitution instruction signal 28 communication control Instruction signal 30 System bus 31 Failure recovery module 32 System control module 33, 34 Communication control module

Claims (2)

[Claims] 1. A plurality of communication control modules for controlling communication of terminals, a system control module for instructing failure monitoring processing and communication control of each communication control module, and a failure recovery module for performing failure recovery processing of each communication control module. In a multiprocessor system in which and are connected by a single system bus, the system control module that has detected a failure of the communication control module controls in advance the terminal whose communication is controlled by the failed communication control module. It is characterized by allowing another communication control module to act on its behalf in accordance with the priority order registered for each terminal, and to enable quick recovery of communication with the terminal before the failed communication control module is recovered. Communication failure recovery method in multiprocessor system. 2. A plurality of communication control modules for controlling communication of terminals, a system control module for instructing failure monitoring processing and communication control of each communication control module, and a failure recovery module for performing failure recovery processing of each communication control module. In a multiprocessor system in which and are connected by one system bus, each terminal controlled by the communication control module belongs to a plurality of communication control modules, and the system control module is When a failure is detected in a failure monitoring processing section that instructs module failure monitoring processing and communication control, a communication control instructing section, and a certain communication control module, another communication control module is instructed to perform communication on behalf in advance according to the priority order of registration. A multi-processor characterized by having a request communication proxy instruction unit Ssashisutemu.