The Process of Synchronization in Dual Redundant Fault-Tolerant System

Synchronization is used in dual redundant fault-tolerant system to make two computers work jointly. It determines the work mode and controls the operations of the system. The paper presents a dual redundant fault-tolerant system and proposes its process of synchronization based on task. The synchronization treats task as the minimal operation unit. And it is implemented with the assist of dual-computer-controller and outer memory, the latter includes task buffer and global data region. Dual-computer-controller controls the input and output of tasks that are stored in task buffer. The switch in of backup computer is implemented by duplicating global data from global data region used by host computer. Additional resolutions for key points, such as the switch between two computers, are also put forward in conclusion. It is proved that the task-level synchronization can make two computers work in phase, and the system is applicable to critical fields requiring high