Dependability Research of Cluster System Based on Stochastic Petri Net

Cluster system has become infrastructure, which constructs high performance distributed systems. The quality of service (QoS) that offers for users will be affected by dependability at large. Stochastic Petri nets (SPN) is a kind of flexible modeling tool, and it has established matured theory system on the research of dependability. The SPN is taken advantage of to model front-end dispatcher and backend workers respectively, and the SPN model of the whole cluster system is presented. It has taken the repairing assurance into consideration when modeling cluster system. Based on the model analyzing, different dependable parameters of the cluster system are given out, and then the model is simulated. The simulation results show that the dependability of cluster system model will increase largely after the key system front-end dispatcher has been given necessary repairing assurance.