NDLI: A performance evaluation tool for RAID disk arrays

Content Provider	IEEE Xplore Digital Library
Author	Thomasian, A. Han, C. Fu, G. Liu, C.
Copyright Year	2004
Description	Author affiliation: Dept. of Comput. Sci., New Jersey Inst. of Technol., Newark, NJ, USA (Thomasian, A.; Han, C.; Fu, G.; Liu, C.)
Abstract	While the performance of individual disks is well understood, the performance of disk arrays configured as redundant arrays of independent disks - RAID requires further investigation. We report on a tool that can be used for the performance evaluation of k disk failure tolerant (kDFT) disk arrays. RAID0 is a 0DFT. RAID5 is a 1DFT utilizing a single check disk. RAID6, EVENODD, and RDP are 2DFTs with two check disks and a minimum level of redundancy, while RM2 is a 2DFT with a slightly higher redundancy level. The capacity overhead is less important for high capacity modern disks than the disk access overhead to update parities, especially the small write penalty. Degraded mode operation and rebuild processing incur extra overhead on surviving disks. The RAID level, configuration, operating mode (normal, degraded with 1 or 2 failures, and rebuild mode with various options), and workload characteristics have a significant effect on RAID performance, which can be evaluated using our tool. We consider here only discrete requests and derive cost functions to determine: (a) the volume of data to be transmitted; (b) the maximum attainable throughput for given disk characteristics; (c) the mean response time given the execution plans of RAID operations specified as dags (directed acyclic graphs). Analytic solutions are possible when arrivals are Poisson with the FCFS policy. Some interesting results obtained by the tool are given to illustrate its capabilities.
Sponsorship	Fac. of Electr. Eng., Math. and Comput. Sci., Univ. of Twente R. Netherlands Acad. of Arts and Sci. Netherlands Organ. for Sci. Res. Centre for Telematics and Inf. Technol., Univ. of Twente Inst. for programming Res. and Algorithmics
Starting Page	8
Ending Page	17
File Size	622340
Page Count	10
File Format	PDF
ISBN	0769521851
DOI	10.1109/QEST.2004.1348011
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-09-27
Publisher Place	The Netherlands
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Degradation Computer science Redundancy Storage automation Cost function Throughput Explosions Protection Delay Capacity planning
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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