双容错磁盘阵列校验散布布局的优化

Dual fault-tolerant disk arrays to optimize the layout of check spread

采用模拟退火算法,对双容错磁盘阵列RAID6的数据布局进行校验散布优化,并且根据理想数据布局最主要的标准"重构负载均匀分布",以及对性能影响也较大的标准"校验负载均匀分布",对这种校验散布算法进行了验证,最后通过仿真实验,测试它的性能,并做出分析,结果显示该方法使RAID6在降级模式和重构模式下的负载得以均匀分布,从而使它的性能得以提高。

RAID exhibit very poor performance in the presence of a disk failure. The'Parity Declustering' techniques for distributing the workload induced by a disk failure across a large set of disks, thereby reducing the impact of the failure recovery process on the system as a whole.The improvements in performance during failure recovery can be obtained through the careful design of the algorithms used to recover lost data from redundant information.