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Journal of Electronic Imaging

Traffic characteristics of striped disks in video servers with visual search functions
Author(s): Hideki Sakamoto; Hideharu Suzuki; Kazutoshi Nishimura
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Paper Abstract

A striping scheme is proposed in which a video program is partitioned into small segments that are stored by distributing them across multiple disks in a video server. In a striped-disk system, the read workload will always be evenly distributed among the component disks as long as the terminals accessing the server perform only normal playback of the video materials. However, if normal playback is combined with visual search capabilities such as jumps and skip searches, then the workload on disks could become momentarily unbalanced or skewed, which could cause interruptions in playback at terminals. In this work, we developed a queueing network model for representing multiple accesses to video materials striped across multiple disks of a video server. An approximate analysis was performed on the model to clarify the traffic characteristics of disks when visual searches are executed. One useful finding for the design of video servers is that, spreading video data over a larger number of disks through striping alleviates momentary workload skewing, which enables a server to support more multiple accesses per disk.

Paper Details

Date Published: 1 July 1998
PDF: 7 pages
J. Electron. Imag. 7(3) doi: 10.1117/1.482655
Published in: Journal of Electronic Imaging Volume 7, Issue 3
Show Author Affiliations
Hideki Sakamoto, Nippon Telegraph and Telephone Corp. (Japan)
Hideharu Suzuki, NTT Human Interface Labs. (Japan)
Kazutoshi Nishimura, NTT Human Interface Labs. (Japan)

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