计算机工程与应用 ›› 2009, Vol. 45 ›› Issue (1): 86-88.DOI: 10.3778/j.issn.1002-8331.2009.01.025

• 研发、设计、测试 • 上一篇    下一篇

RAID系统中的一种伪并行I/O调度策略

罗 迅1,徐海峥2,裴 京2,李达成3   

  1. 1.湖南师范大学 数学与计算机科学学院,长沙 410081
    2.清华大学 光盘国家工程研究中心,北京 100084
    3.清华大学 精密仪器与机械学系,北京 100084
  • 收稿日期:2008-06-30 修回日期:2008-10-06 出版日期:2009-01-01 发布日期:2009-01-01
  • 通讯作者: 罗 迅

Pseudo-parallel I/O schedule of RAID based on close queuing model

LUO Xun1,XU Hai-zheng2,PEI Jing2,LI Da-cheng3   

  1. 1.College of Mathematics and Computer Science,Hunan Normal University,Changsha 410081,China
    2.Optical Memory National Engineering Research Center,Tsinghua University,Beijing 100084,China
    3.Department of Precision Instrument and Mechanology,Tsinghua University,Beijing 100084,China
  • Received:2008-06-30 Revised:2008-10-06 Online:2009-01-01 Published:2009-01-01
  • Contact: LUO Xun

摘要: 磁盘阵列系统中,如何提高I/O传输率一直是一个关键性问题。基于并行性思想,一种伪并行I/O调度策略被应用在带缓存的磁盘阵列系统之中。该调度策略力图在外部I/O请求响应和内部数据迁移之间形成并行操作,最大限度地提高close队列的I/O请求的数据传输率。实验表明,该策略有效地提高了磁盘阵列系统外部I/O通道的持续数据传输率,并在一定程度上缓解了RAID5的小写问题。

Abstract: It is an important key problem all the time that how to boost the I/O performance of the RAID subsystems.A pseudo-parallel I/O schedule is proposed for this problem based on the idea of parallelism.The scheduler is focused to handle the exterior I/O transfer and interior data migration synchronously as far as possible.The experimental results prove that the scheduler is effective to improve the sustained data transfer rate of RAID arrays.Moreover,the scheduler partially settles the problem of small write for RAID5.