NDLI: Balancing I/O response time and disk rebuild time in a RAID5 disk array

Content Provider	IEEE Xplore Digital Library
Author	Hou, R.Y. Menon, J. Patt, Y.N.
Copyright Year	1993
Description	Author affiliation: Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA (Hou, R.Y.)
Abstract	When a disk in the RAID5 disk array architecture has failed, requests to that disk can only be serviced by reading data from all surviving disks and rebuilding the lost data. This may cut disk performance in half. To avoid this degradation, all of the lost data must be rebuilt and written to a spare disk. The faster the data are rebuilt, the sooner the disk array returns to normal operation. Giving high priority to the rebuild process, however, can increase response times for incoming application requests which complete for disk service. A balance must be found between acceptable application response times and disk rebuild times. Simulation was used to evaluate the effect of the rebuild unit size on response time and rebuild time. The authors have found this tradeoff to be embodied in the choice of the rebuild unit and the amount of rebuild data which is atomically read from each surviving disk. The find that a single track rebuild unit provides faster rebuild times than a one sector rebuild unit. Rebuilding one track at a time provides better application request response times when compared with rebuilding one cylinder at a time.
Starting Page	70
Ending Page	79
File Size	818432
Page Count	10
File Format	PDF
ISBN	0818632305
DOI	10.1109/HICSS.1993.270756
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-01-08
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay Degradation
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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