信息系统结构层次分析与系统可靠性

Hierarchy Analysis of Information System Structure andSystem Reliability

在信息系统结构设计中，适量的设备冗余是提高系统整体可靠性的有效手段之一，但对哪些设备冗余才能以较少的投资获取较高的可靠性则是首先要解决的问题。文章通过对信息系统Ｐｅｔｒｉ网模型的层次结构分析在这方面取得了一定的进展，较好地克服了在冗余设备选择上的经验性和片面性，并通过对信息系统不同层次网络的冗余策略、所需设备的数量、以及相应的系统可靠度之间的对比，给出了一些定量的分析结果，以供参考。

In the structure design of informahon system, one of the means to improve the reliability as a whole system is the equipments redundance, but the first question should be answered is how to acquire higher reliability bya few redundant equipments. This paper has made some progress at this field by hierarchy analysis of InformationSystem strUcture, and overcome the experientialism and one-sidedness in choosing redundant equipments.Finally,the paper gives some result of quantitative analysis by comparing the system reliability, number of equipments, aswell as the redundant policy based on the various hierarchy networks.