Articles

Traffic characteristics of striped disks in video servers with visual search functions

[+] Author Affiliations
Hideki Sakamoto

Nippon Telegraph and Telephone Corporation, Marketing Group, OCN Service Division, Tokyo Opera City Tower 21F, 3-20-2, Nishi-shinjuku, Shinjuku-ku, Tokyo?163-14, Japan

Hideharu Suzuki, Kazutoshi Nishimura

Nippon Telegraph and Telephone Corporation, NTT Human Interface Laboratories, NTT Musashino R&D Center, M5-508A, 3-9-11, Midori-cho, Musashino-shi, Tokyo?180, Japan

J. Electron. Imaging. 7(3), 701-707 (Jul 01, 1998). doi:10.1117/1.482655
History: Received April 15, 1996; Revised March 3, 1998; Accepted March 10, 1998
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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. © 1998 SPIE and IS&T.

© 1998 SPIE and IS&T

Topics

Video

Citation

Hideki Sakamoto ; Hideharu Suzuki and Kazutoshi Nishimura
"Traffic characteristics of striped disks in video servers with visual search functions", J. Electron. Imaging. 7(3), 701-707 (Jul 01, 1998). ; http://dx.doi.org/10.1117/1.482655


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