一种高可用异构容错系统的混合可用性模型

为解决高可用异构容错系统的可用性评价问题,提出了一种针对高可用异构容错系统的混合可用性评价模型。设计实现异构容错原型系统,包括硬件体系结构框架及软件系统。采用Markov过程与随机Petri网相结合的方式,从可用性量化和系统状态转换两方面构建系统的可用性模型。根据该可用性模型估算系统的高可用指标,并与同构及非容错单机系统进行比较分析。结果表明,该可用性模型能够对异构容错系统进行准确的可用性评价,验证了系统5个9的高可用指标要求。最后总结了影响系统高可用性的主要因素及提升系统可用性的有效方法。

Mixed Availability Model on High-availability Heterogeneous Fault-Tolerant System

In order to solve the problem of availability evaluation on high-availability heterogeneous fault-tolerant system, the paper proposes a mixed availability evaluation model for such system. Firstly, a heterogeneous fault-tolerant prototype system is designed and implemented, including hardware architecture framework and software system. Then, by applying mixed Markov process and stochastic Petri net method, an availability model is built according to aspects of availability quantitative and system state conversion. In the meantime, the system high-availability index is evaluated through such availability model, and compared by homogeneous system and stand-along system. The results show that such availability model can not only precisely evaluate the system availability, but also verify the 5 9s high-availability index requirement. At last, two main factors affecting system high-availability has been concluded: system mean time between failures and total reparation time.