视频访问负载的分级存储及迁移算法研究

为了使分布式分级混合存储系统高效、快速响应的工作,达到优化系统性能和减少系统资源消耗的目标,通过研究负载的模式,同时考虑数据访问局部性和系统响应时间,提出了相应于负载识别、以及基于频率策略和带宽策略的分级存储迁移算法,提出了一种目标函数为(带宽节省率/命中率)的新评价标准。频率策略是根据访问的周期频率特性来进行数据分级存储迁移,带宽策略是根据在访问中考虑迁移带宽消耗特性来进行数据分级存储迁移。结合实例,模拟仿真实验结果表明,两种策略都能有效地到达目标。频率策略带来的访问次数及命中率较高,而带宽策略可以减少分级存储并发瓶颈数量。

Research on data hierarchical storage and migration based on video access workload

To achieve system efficiency,quick-response and balancing between performance and resource consumption in distri-buted hierarchical hybrid storage system,a hierarchical storage migration algorithm based on accessing characteristics is presented.It takes data accessing locality and system response time into consideration and gives two migration strategies corresponding to frequency and bandwidth.A new evaluation function is provided which is bandwidth saving per hit rate.Frequency strategy migration the data object by rank of frequency and the other strategy follows by the value of frequency times data object size.The simulation result demonstrates that two strategies can reach target effectively.Frequency strategy brings higher hit rate while the bandwidth strategy can reduce the bandwidth bottleneck in storage system.