【摘要】 磁盘具有离磁盘轴心越远的分区其数据传输率越高的特点,然而传统 RAID 中文件分条单元在磁盘中是随机和静态存放的。针对此种情况,为了充分改进 RAID的 I/O 性能,本文提出了一种动态的 RAID 数据分条存放和迁移策略 PMSH(Placement and Migration based on Stripe unit Heat)。PMSH 根据 RAID 中的文件分条单元的访问热度,动态地将访问频率高的分条单元迁移到数据传榆率较高的磁盘分区,从而优化文件在 RAID 的存放位置,使RAID 中的数据分布能够适应文件访问率的动态变化。仿真实验的结果表明:PMSH 算法能够显著地改进整个 RAID的 I/O 性能,具有很好的实用价值。更多还原

【Abstract】 The outer zone of the disk has higher data transfer rate as compared to the inner one,while in traditional RAID,the location of stripe unit in each disk is stochastic and static.Facing this situation,to exploit RAID I/O per- formance fully,this paper proposes a new strategy PMSH(Placement and Migration based on Stripe unit Heat).Based on the heat of RAID stripe unit,PMSH keeps migrating the frequently accessed stripe unit to the disk zone with higher data transfer rate,thus optimize the location of data in RAID disks,and make the data distribution adapt to the evolu- tion of file access pattern dynamically.Simulation results demonstrate significant RAID I/O performance improvement could be obtained via PMSH.更多还原