RAID控制器的Cache管理策略研究  

The Cache Management Strategy Research on RAID Controller System

作　　者：陈云霄[1] 王丽芳[1] 蒋泽军[1] 

机构地区：[1]西北工业大学计算机学院,陕西西安710129

出　　处：《微电子学与计算机》2014年第7期172-176,共5页Microelectronics & Computer

基　　金：航空科学基金项目(2012ZC53040);西北工业大学研究生创业种子基金项目(Z2013131)

摘　　要：为进一步缩小外存与CPU间的速度差异,满足日益增高的I/O请求率,在磁盘阵列设计中引入Cache,实现一种适用于RAID控制器的Cache管理策略。此方法重点研究了Cache的组织与管理,利用优化的最近最少使用算法(LRU)提高Cache命中率,通过树形结构的转换减少磁盘I/O次数,以提高系统的整体性能.从该策略在RAID控制器原型的实验结果分析,证明该策略对减少写磁盘I/O确有显著效果.To reduce further the speed difference between the external memory and the CPU ,and to meet more and more I/O request rate , Cache is introduced in the disk array . The strategy focuses on the organization and management of Cache .Taking use of the Least Recently Used algorithm optimization (LRU ) improves Cache hit rate and taking use of the conversion between tree structures reduce disk I/O times in order to improve the overall system performance .The experimental results prove that the strategy has really a significant effect to reduce disk w rite I/O .

关 键 词：CACHE LRU算法优化 命中率 I/O写延迟 

分 类 号：TP333.3[自动化与计算机技术—计算机系统结构]