基于层次变权的云服务可靠性评估模型

Reliability evaluation model of cloud services based on variable weights

针对当前可靠性评估模型解决动态、复杂、多变的云服务环境下支持可靠云服务协同应用中存在的不足,提出基于层次变权的云服务可靠性评估模型.根据云服务IaaS层、PaaS层和SaaS层应用的特点,借鉴AHP层次变权的思想,分析了层次云服务的失效关联关系,给出了利用三角模糊数的相关原理量化可靠性权重值的方法,基于互补判断矩阵给出了权重值的排序求解公式;结合云服务系统中各层次云服务的实时在线监测可靠性数据,给出了层次云服务可靠性评估计算公式.该模型计算量小,简单易行,操作性强,能对云服务可靠性进行合理、动态评估,具有较好的应用推广价值.

In view of the drawbacks in the reliable cloud service coordinate application provided by the current reliability evaluation model, which is under the dynamic, complex and changeable cloud service conditions, a reliability evaluation model of cloud service based on variable weights is proposed in this paper. According to the application characteristics of IaaS, PaaS and SaaS cloud service, the reliability evaluation index stratification architecture of cloud service is established, and the hierarchy analytic structure of the reliability model is built. In reference to the thought of AHP variable weights, the reliability importance weights value between each layer services is given a quantitative analysis using the related principles of triangle fuzzy number, and a new weights value order calculating method is given out by the triangle fuzzy complementary judgment matrix. In addition, combined with the online monitoring reliability data of cloud service system in each level of cloud services, the reliability evaluation calculating formulae of cloud services are put forward. Comparing to others, the model which presented in this paper lies in the smaller computation, simple implement, strong practical, and Call evaluate the reliability of cloud service reasonably and dynamically, it is worth applying and popularizing.