网格副本选择策略算法的研究

Research on the Algorithm of Replica Selection Strategies for Grids

副本管理是数据网格中一个重要的组成部分,良好的数据副本管理策略是提高数据网格服务质量(Qos)的一个重要方面,本文主要对副本管理策略中的副本选择策略进行了研究。数据副本的选择策略讨论的是在己知的多个数据副本中如何根据当时的网络状态选择一个最佳的数据副本。本文提出了基于遗传算法的副本选择策略,这种选择策略考虑了多个副本请求对应多个副本资源的最佳分配方案,利用遗传算法得到最佳的数据副本分配方案,使副本的选择策略更高效。

Replica Management is one of the critical parts in Data Grids. Excellent replica management strategies are important to improve the Qos in data grids. This paper investigates on the replicas selection strategies about replica management in data grids. Replicas selection strategies discuss how to select the best replicas among the current known replicas. The paper brings tbrward the strategy based on heredity arithmetic. This selection strategy uses heredity arithmetic find the best replicas- distributed scheme of some replicas requesting and some replica resources.