CAJ | 학술논문

I/O调度对存储系统的性能、响应速度有很大的影响.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.我们设计了一种适合该系统的磁带I/O调度算法SCAN-M.该算法与应用于磁盘I/O调度的电梯算法类似,但针对磁带的特点进行了调度的排序和合并.从仿真结果看,SCAN-M算法对系统的I/O性能有较大的改进.
I/O조도대존저계통적성능、향응속도유흔대적영향.본문개소료일충용우지질감탐영역수거존저적Ro-RAT(Read Only RAID-tape-library)계통.해계통채용자반작위자대고적완존계통,이제고정개계통적독취속도.아문설계료일충괄합해계통적자대I/O조도산법SCAN-M.해산법여응용우자반I/O조도적전제산법유사,단침대자대적특점진행료조도적배서화합병.종방진결과간,SCAN-M산법대계통적I/O성능유교대적개진.
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. Base on the study of the accessing characteristic, a new I/O schedule algorithm called SCAN-M is introduced. SCAN-M is similar to "elevator" used widely in disk I/O scheduling, but merges the I/O request in a different way. To evaluate the performance of SCAN-M algo-rithm, trace-driven simulation experiments were taken. The result shows that SCAN-M can reduce system response time significantly.