NDLI: Data prefetching to reduce energy use by heterogeneous disk arrays in video servers

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Content Provider	ACM Digital Library
Author	Lee, Yeongju Kim, Euiseok Song, Minseok
Abstract	As the storage requirements of a video server increase, disks of different types are often added. This makes it essential to manage the energy requirements of heterogeneous disk arrays. We examine how seek operations affect disk energy consumption, and then analyze the relationship between the amount of prefetched data and the number of seeks, and the effect of the size of the prefetching buffer on energy consumption. Based on this, we propose a new data prefetching scheme in which the amount of data prefetched for each video stream is dynamically adjusted to allow for the bit-rates of streams and the power characteristics of different disks, with the aim of minimizing overall disk energy consumption. Simulations show that our scheme can reduce disk energy by 26%, compared to a server in which prefetching is not used.
Starting Page	1
Ending Page	6
Page Count	6
File Format	PDF
ISBN	9781450318921
DOI	10.1145/2460782.2460783
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-02-26
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Multimedia storage systems Power management Low-power systems
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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Data prefetching to reduce energy use by heterogeneous disk arrays in video servers