Research On Key Problems Of Grid Fault-Tolerant

With the development of computer and Internet, Grid has evolved from pure high performance computing system into a system to coordinate distributed, dynamic and heterogeneous resources. However, fault-tolerant issue for Grid system is becoming a tough problem due to the inherent characteristic of Grid. In this paper, we propose an adaptive task-level fault-tolerant approach for Grid. The proposed approach is based on the classic four fault-tolerant approaches: retry, alternate resource, checkpoint and replication. We implement a prototype of the proposed approach in CGSP (ChinaGrid Support Platform). Simulation and experiments based on a real Bioinformatics Grid has proved that the adaptive fault-tolerant approach is better than existing approaches.Main contributions of this paper are:●Propose a new adaptive fault-tolerant approach. This approach gains better performance than existing ones both in terms of metrics mean execution time and resource consumption.●Corresponding model of mean execution time has been constructed based on probability method.●Propose the metric resource consumption as another important metric to evaluate any fault-tolerant approach.●Construct mathematical models for existing approaches and our adaptive approach based on resource consumption.●Simulation has been made, and simulation results show that our approach exceed all other ones in terms of both metrics mean execution time and resource consumption.●Experiments based on a real Bioinformatics Grid has been made, and experiment result again proves that our adaptive approach is best.