【摘要】 针对现有存储系统不能很好的动态适应工作负载变化情况,本文提出了逻辑进化存储系统的概念,由此设计了一种适合不同磁盘阵列(RAID)之间动态转换的数据分布策略.根据这种策略推导出RAID在同步工作负载情况下的平均响应时间公式,计算出不同RAID级别在各种工作负载情况下的转换门限.为了提供最佳的服务特性,本文还提出根据数据访问的特征自动调节条带单元大小(SUS:StripeUnitSize)的策略,并推导出磁盘阵列在不同工作负载情况下的最优SUS.最后,通过大量的实验验证了本文的分析结果.更多还原

【Abstract】 In order to change the status that storage system can not adapt to dynamic workloads,The paper introduced a new concept of logistic evolution storage system and design a data layout which can make transformation among varies RAID levels easy.By analyzing action of RAID1 and RAID5 under synchronous workload, we deducing a approximation analytical expression to predict disk array mean response time and compute threshold of parameters for RAID organization transformation. In order to get the best performance for varies RAID levels,we also introduce a method which adjusts stripe unit size for adapting varies workloads and deduce the optimal stripe unite size. Finally, we carry out a large number of simulations to validate our analytical result.更多还原