Performance analysis of the raid 5 disk array

Anand Kuratti, William H Sanders

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

While the processor and memory performance of computers continues to improve, I/O performance has remained relatively constant. Strategies to achieve better I/O performance than current disk systems have been investigated to address the growing I/O bottleneck. One effort is the RAID (Redundant Arrays of Inexpensive Disks) Level 5 disk array. RAID 5 offers increased parallelism of I/O requests through the disk array architecture and fault tolerance through rotated parity. Although RAID 5 offers the promise of improved I/O performance, such gains must be quantified. Accurate analytical modeling can be used to quantify and predict the I/O request response time for different workloads. While previous analytical models to calculate the I/O request response time have been constructed, they often rely upon simplifying assumptions or computational bounds, which are accurate for certain values of the possible workload parameters. This paper presents an analytical performance model to compute the mean steady state response time of a RAID 5 I/O request under a transaction-processing workload. By carefully considering individual disk accesses, the arrival process of disk requests, and correlation between disk requests, an accurate model for a wide range of the workload parameters is developed.

Original languageEnglish (US)
Title of host publicationProceedings - International Computer Performance and Dependability Symposium
Pages236-245
Number of pages10
StatePublished - 1995
EventProceedings of the IEEE International Computer Performance and Dependability Symposium - Erlangen, Ger
Duration: Apr 24 1995Apr 26 1995

Other

OtherProceedings of the IEEE International Computer Performance and Dependability Symposium
CityErlangen, Ger
Period4/24/954/26/95

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Kuratti, A., & Sanders, W. H. (1995). Performance analysis of the raid 5 disk array. In Proceedings - International Computer Performance and Dependability Symposium (pp. 236-245)