分析了基于独立故障检测单元的双机热备系统存在的问题,提出了一种基于双机联合故障检测的双机热备系统方案,通过主、备单元的自检和它检实现故障检测功能.利用马尔可夫过程,对基于独立故障检测单元和基于双机联合检测方案的双机热备系统分别进行可靠性建模和仿真计算,分析其可靠性和安全性指标.根据仿真结果对两种方案的可靠性、安全性和经济性水平进行了分析比较,比较结果表明,两种方案的优劣与β值以及系统资源利用情况有关,当β≥0.8并且系统有较多空闲资源时,基于双机联合故障检测方案的双机热备系统完全可以达到甚至超过基于独立故障检测单元方案的双机热备系统可靠性和安全性水平,并且结构更为简单,成本更低.%The problems that dual computer hot-standby system based on independent fault detection unit exists are analyzed, and to solve the problems, a dual computer hot-standby system based on dual computer joint fault detection is proposed, which uses its master unit and spare unit to realize fault detection. By establishing Markov models and simulation respectively, the reliability and security of the two schemes are analyzed. Comparisons on reliability, security and economy between the two schemes are drawn, and the results of comparisons show that the dual computer hot-standby system based on dual computer joint fault detection has higher reliability and security, and holds simpler structure and lower cost when the system has more idle resources and (3 is greater than 0. 8.
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