Extended Virtual-tree Grid Reliability Evaluation Model
An extended reliability evaluation model is proposed,which is extended from existing Virtual Tree Grid Reliability Evaluation Model.In the extended model,a new type of failure is introduced to support reliability evaluation for real-time jobs in grid environments.By applying queueing system to model the working of grid resources,the proposed model is capable of supporting the resources with parallel processing capability,which is unsupported in previous model.The validity of the extended model and its approach to calculate real-time job's reliability are presented theoretically,and extensive simulations are conducted to verify its performance.Experimental results show that the proposed model can significantly improve the accuracy of reliability evaluation in presence of high-level workload.Also,it is able to reduce the jobs' mean response time due to its workload-aware feature.