2Q/F: 用于Ro-RAT系统中的缓存替换算法
首发时间:2008-09-15
摘要:缓存对存储系统的性能、响应速度起着至关重要的作用。本文介绍了一种用于地质勘探领域数据存储的Ro-RAT(Read Only RAID-tape-library)系统。该系统采用磁盘作为磁带库的缓存系统,以提高整个系统的读取速度。根据这个系统的访问特点,我们设计了一种新的2Q/F缓存算法。该算法基于2Q算法,并针对Ro-RAT的特点进行了改进。从仿真结果看,2Q/F算法的缓存命中率比LRU和2Q算法高出约15%。
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2Q/F: A new Replacement Algorithm for Ro-RAT System
Abstract:Tape is used widely in high reliability storage system. This paper introduces a storage system named Ro-RAT (Read only RAID-Tape-Library) which can be used in geological exploration storage. Tape is used as storage medium in Ro-RAT. Due to the sequence access to tape devices, a disk cache is used to reduce access time. Base on the study of the accessing characteristic, a new replacement algorithm called 2Q/F is introduced. The cache objects in 2Q/F are files, compared to pages in 2Q. As the files have different length, 2Q/F considers not only the access frequency of cache objects but also the size. To evaluate the performance of 2Q/F algorithm, trace-driven simulation experiments were taken. Compared to LRU and 2Q, 2Q/F improves hit rate for about 15% in Ro-RAT system.
Keywords: cache 2Q replacement algorithm
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No.2401831072612214****
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