【摘要】 在常见的层次拓扑结构的数据网格环境中提出一种动态备份模型 ,实现了备份的自动创建、删除和更新 ,优化了备份的放置策略 ,并为用户数据访问自动选择文件或备份服务 .更多还原

【Abstract】 A model for dynamic replica in the data grid environment based on tier-structure network topology was provided. The model consisted of modules such as replica catalog,resource manager,access logger,replica manager and replica transporter. It can create,delete and modify replicas and choose the best file or replicas data for user access. It will reduce access latency and network consumption and improve the load balance and data availability.更多还原