为了满足网格数据服务的可靠性和传输时间约束,同时兼顾网络负载及节点资源的有效利用,提出了一种网格数据资源选择优化模型,该模型以网络负载和资源代价为优化目标函数,以节点的传输速度、可靠性、传输距离、网络状态、客户端带宽和容忍度阈值为输入,进而决策出参与服务的最优节点集合,同时模型中设定了权重因子来均衡网络负载与资源代价。针对资源选择优化模型又提出了备份节点传输策略,以进一步提升模型的可用性。仿真实验证明了资源选择优化模型和备份节点传输策略的正确性和有效性。
In order to meet data grids' data service reliability and transmission time constraints, and to take account of the network load and efficient use of node resources, a resource selection optimization model for data grid is presen- ted. The model can give the optimal decision-making of the collection for participating nodes, and at the same time, set the weighting factor to balance network load and resource costs. A backup node transmission strategy is proposed to further enhance the usability of the model. The simulative experiments show that the model and the strategy are correct and effective.