基于VxWorks的高可用容错系统的设计与实现

文中设计了一种容错系统,该系统是建立在应用程序层之下、操作系统层之上位置结构的中间件。系统由三模冗余与其之间的通信链路组成系统的硬件结构以及由故障检测模块（对节点的检测和对应用程序的检测）、故障处理模块所组成的软件部分构成。基于VxWorks实时操作系统,设计了一种高可用的容错中间件系统,分析了系统的组成原理,给出了基于心跳检测的故障检测机制和N版本编程方法进行故障检测,以及前向和后向任务恢复方法进行故障恢复,并实现了原型系统。试验表明：给出的容错中间件系统具备了基本的容错能力,可有效提高系统的可用性和可靠性。

Design and Implementation of High Available Fault-Tolerant System Based on VxWorks

The following system which is between the application layer and OS layer is a middleware.The three modules redundant structure and the communication bus compose the hardware shap;The software system contains fault-detection module and fault-handle module.The hardware shap and the software system form the whole fault-tolerant system.Based on VxWorks OS,firstly,a high available fault-tolerant middleware system is designed.Then principle of composition which belongs to the system is analyzed,and it presents a fault detection mechanism based on heartbeat detection and the N-VERSION programming detection method.As well as,the backward and forward task recover method is utilized.Finally the prototype system is implemented.Experiments demonstrate the fault-tolerant middleware is helpful for enhancing the software fault tolerance of system.