Analysis of Cluster Servers′ Data Availability Using Markov Process Model

Accurate analysis and evaluation of availability has long been important in cluster servers′ design.This paper presented a formal method to evaluate the availability of cluster servers accurately based on the Markov process model.The quantitative relationship among availability of clusters,availability of server,data replica distribution and the number of servers in clusters had been measured and a series of theory including a formula which can provide accurate evaluation of cluster servers′ availability had been provided and proved.The contribution of this paper was not only in theory,but also in practice because the theories and conclusions can be taken into practice in cluster servers design to forecast the availability of system when the availability of server nodes were constrained.