RAID5中的效率优先倒盘算法  

The DEF Algorithm in RAID5

作　　者：陈康林[1] 谢长生[1] 

机构地区：[1]华中科技大学计算机科学与技术学院,湖北武汉430074

出　　处：《计算机工程与科学》2006年第2期81-82,85,共3页Computer Engineering & Science

基　　金：国家自然科学基金资助项目(60173043)

摘　　要：在带有Cache的RAID5系统中,倒盘算法对于提高系统的IO性能起着十分重要的作用。本文研究了一些现有倒盘算法,并针对RAID5提出了一种基于系统状态分类的倒盘效率优先算法。该算法的主要思想是以当前的Cache占用率和负载特性为依据,根据倒盘效率优先的原则动态地调整倒盘策略。同时,本文还给出了实现这种倒盘算法的关键技术,并测试和分析了该算法的性能。Destage algorithms play an important role in improving IO performance in cached RAID5 systems, In this pa- per, the authors study a number of existing destage algorithms, and propose a destage-effieiency-first （DEF） algorithm based on the classification of system status for RAID5 systems. The main idea of this algorithm is that destage strategy will be dynamically adjusted on the principle of detage efficiency according to the current cache occupancy level and varying workload. In addition, the authors present the key technology in implementing the DEF algorithm, and test and analyse the performance of the algorithm.

关 键 词：RAID5 小写 缓存 倒盘 

分 类 号：TP333[自动化与计算机技术—计算机系统结构]