Active Bolck Layout:一种高性能磁盘布局机制  

Active Block Layout: A High Performance Block Layout Mechanism

作　　者：卢军[1] 卢显良[1] 罗光春[1] 韩宏[1] 魏青松[1] 

机构地区：[1]电子科技大学计算机学院,成都610054

出　　处：《计算机科学》2003年第3期164-167,共4页Computer Science

基　　金：国家95重点攻关项目

摘　　要：The access frequency of different files in file system is dissimilar. If file system can optimize the block lay-out of these hot files which are frequently accessed,the performance of file system will be improved. This paper pre-sents a high performance block layout mechanism: Active Block Layout (ABL). ABL can record the access frequencyof every file in file system and actively optimize the block layout of these hot files by block duplicating. The duplicatedblocks can be placed in the special zone of track,which is called "Cooling Zone". ABL can automatically determine theplacing position and the copy count of the blocks which need to be duplicated. In order to reduce the overhead of blockduplication,this paper also presents a mechanism which uses the potential disk bandwidth to realize the block duplica-tion,and does not obviously degrade the performance of file system.The access frequency of different files in file system is dissimilar. If file system can optimize the block layout of these hot files which are frequently accessed,the performance of file system will be improved. This paper presents a high performance block layout mechanism: Active Block Layout (ABL). ABL can record the access frequency of every file in file system and actively optimize the block layout of these hot files by block duplicating. The duplicated blocks can be placed in the special zone of track,which is called 'Cooling Zone'. ABL can automatically determine the placing position and the copy count of the blocks which need to be duplicated. In order to reduce the overhead of block duplication,this paper also presents a mechanism which uses the potential disk bandwidth to realize the block duplication,and does not obviously degrade the performance of file system.

关 键 词：ActiveBlockLayout 高性能磁盘布局机制 磁盘存储系统 磁盘驱动器 计算机 

分 类 号：TP333.35[自动化与计算机技术—计算机系统结构]