JPH01129329A - System for switching duplexing system - Google Patents

Abstract

PURPOSE:To automatically switch a system without missing the timing of a switching by detecting a system-down due to the hardware of the system to be composed of a main system and a sub-system through a health checking channel and switching the system and a line. CONSTITUTION:When a main system 1 goes to be down while keeping health check disability, the down is detected by a down detecting circuit 71 and informed to a switching device 5. The switching device 5 to receive the information informs a sub-system 2 of preparation to be the main system through system switching channels 41 and 42. Simultaneously, the switching device 5 immediately instructs the switching to a line switching device 6 and executes the switching of the system interlocked with the switching device 5. Thus, a duplexing system switching system can be obtained so as to prevent a time delay.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a duplex system, and more particularly to an automatic switching system between a main system and a sub system.

(Conventional technology) Conventionally, this type of switching method connects each system with a communication channel, determines switching based on the analysis result of health check data via software, and switches the system between the main system and sub system. It was done automatically.

(Problems to be Solved by the Invention) The conventional switching method described above uses a health check that includes software intervention, so if the main system stops while the software is unable to operate,
Switching the threads has the drawback that the threads must be switched for a period corresponding to the health check monitoring timer time of the normal system at most.

The purpose of the present invention is to detect a system failure due to the hardware of the system below the main/sub system via a health check channel, and to eliminate the above drawbacks by switching the system and line so that there is no one hour delay. The object of the present invention is to provide a structured redundant system switching method.

(Means to Solve the Problem) The redundant system switching method according to the present invention includes a pair of systems forming a main/sub system, a health check channel for performing a health check between the pair of systems, and a pair of systems. Is there a switching device for switching the relationship between the main system/subsystem between the lines? This system is fully equipped with a line switching device for switching.

In the above, each of the pair of systems detects all system down and switches to a down switching device? It is equipped with a down detection circuit for notification, a system switching channel for switching the system within the system, and a line control unit for controlling the entire line in relation to the operation of the line switching device. It is constructed.

(Example) Next, one embodiment of the present invention will be explained with reference to all the drawings.

FIG. 1 is a block diagram showing an embodiment of a duplex system switching method according to the present invention. In FIG. 1, 1 is the main system, 2 is the subsystem, 3 is the health check channel, 41 and 42 are the system switching channels, 5 is the switching device, 6 is the line switching device, 71.72
are down detection circuits, and 81 and 82 are line control units, respectively.

Normally, a health check channel 3 is arranged between the main system 1 and the sub system 2, and all health checks are performed using the health check channel 3. When the secondary system 2 receives a complete switchover request from the main system 1 due to some trouble due to a health check, it instructs the switching device 5 to perform a complete switchover through the system switching channel 42 . The switching device 5 instructs the line switching device 6 to perform switching, and completely switches the operation to the subsystem 2. at this point
Switching between the main and sub systems is completed.

If the main system 1 goes down without being able to check its health, the down detection circuit 71 detects the complete down state and notifies the switching device 5 of the down state. The switching device 5 that received the notification uses the system switching channel 41.42.
The preparation to become the main system is notified to the subsystem 2 via the subsystem 2. At the same time, the switching device 5 immediately instructs the line switching device 6 to switch, and works with the switching device 5 to switch the system.

(Effects of the Invention) As described above, the present invention detects a system down caused by the hardware of a system consisting of a main system and a sub system through a health check channel, and switches the system and line, thereby adjusting the timing of switching. This has the effect of being able to automatically switch systems without disconnecting them.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a duplex system switching method according to the present invention. 1.2...System 3...Health check channel 41.42...System switching channel 5...Switching device 6...Line switching device 71.72...Down detection circuit 81.82...・Rotation control unit patent applicant NEC Corporation

Claims (1)

[Claims] A pair of systems forming a main system/sub system, a health check channel for performing a health check between the pair of systems, and a system for switching the relationship between the system consisting of the main system/sub system between the pair of systems. and a line switching device for switching lines in conjunction with the switching, and each of the pair of systems detects that the system is down and notifies the switching device of the downtime. a system switching channel for switching the system within the system; and a line control unit for controlling the line in relation to the operation of the line switching device. A redundant system switching method characterized by: