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Power efficient real-time disk scheduling
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International Workshop on Network and Operating System Support for Digital Audio and Video archive
Proceedings of the 18th international workshop on Network and operating systems support for digital audio and video table of contents
Williamsburg, VA, USA
SESSION: OS and end-systems table of contents
Pages 55-60  
Year of Publication: 2009
ISBN:978-1-60558-433-1
Authors
Damien Le Moal  Hitachi Ltd. Systems Development Laboratory, Kawasaki, Japan
Donald Molaro  Hitachi Global Storage Technologies, San Jose Research Center, San Jose, CA, USA
Jorge Campello  Hitachi Global Storage Technologies, San Jose Research Center, San Jose, CA, USA
Sponsors
SIGCOMM: ACM Special Interest Group on Data Communication
SIGMULTIMEDIA: ACM Special Interest Group on Multimedia
ACM: Association for Computing Machinery
Publisher
ACM  New York, NY, USA
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ABSTRACT

Hard-disk drive power consumption reduction methods focus mainly on increasing the amount of time the disk is in standby mode (disk spun down) by implementing aggressive data read-ahead and caching at the operating system and/or application level. However, these methods cannot be applied efficiently to systems with limited memory and high bit-rate requirements such as digital video recorders handling high-definition video. In this paper, we introduce the Audio/Video File System (AVFS), composed of a file system and a disk I/O scheduler. Compared to traditional methods, the proposed scheduler reduces seek overhead by processing real-time requests to video files using batches built dynamically depending on the requests deadlines. Evaluation results show an important reduction in disk utilization rates and a reduction of up to 20 % of the disk power consumption with only 4 MB of data buffer per video stream.


REFERENCES

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Collaborative Colleagues:
Damien Le Moal: colleagues
Donald Molaro: colleagues
Jorge Campello: colleagues