Active/Standby State Management Method for Dual-machine Hot Standby System

Abstract

The invention provides a main / standby state management method of a hot / standby system. The method mainly comprises a step of arranging an A-series host computer, a B-series hot computer, an A-series host computer IO and a B-series IO which are connected through a communication bus in the hot / standby system, and when the communication bus is available, the A-series hot computer performs data communication with the B-series hot computer, the A-series and the B-series IO through the communication bus. The B-series host computer performs data communication with the A-series host computer, the A-series IO and the B-series IO through the communication bus. According to the main / standby state management method, through dividing the hot / standby system into a host machine part and an input / output (IO) part, the communication bus and a standby communication line are arranged. Based on a specific processing strategy, adverse influences of double main states at the host machine part to outward input output of the input / output (IO) part and the whole hot / standby system can be eliminated. The main / standby state management method can effectively ensure data communication among the A-series host computer, the B-series host computer, the A-series IO and the B-series IO.

Description

technical field [0001] The invention relates to the technical field of dual-system hot backup systems, in particular to a method for managing the active and standby states of the dual-machine hot backup system. Background technique [0002] The dual-machine hot standby system is widely used in various control systems due to its high availability and reliability, certain fault tolerance and easy maintenance for operators. [0003] In the dual-computer hot standby system, the preset and switching of the "main system" and "backup system" is the key to realize the function of the dual-computer hot standby system. In the dual-machine hot standby system, the two systems rely on the interlock logic implemented by hardware or software to confirm the "main" or "standby" status of the two systems. The two departments exchange information through specific communication methods to realize the interlocking logic between the two departments. [0004] A block diagram of an interlock logi...

AI Technical Summary

Problems solved by technology

In extreme cases, once the communication between the two systems is cut off, the interlock logic between the two systems cannot exchange information with each other, and cannot judge whether the other party "system" of the dual-system hot standby system exists, which will cause the original "primary" The system still maintains the primary state, and the original "standby" system is upgraded to the "primary" system by mistake, resulting in a dual-primary state

[0005] The dual-master state will affect the control logic of the dual-system hot standby system, which will bring greater risks to the normal operation of the dual-system hot standby system and enter an unsafe state

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