The dynamic sweep scheme using slack time in the zoned disk

Authors:
Sungchae Lim
Affiliations:
Dongduk Women's University, Seoul, Korea
Venue:
DASFAA'06 Proceedings of the 11th international conference on Database Systems for Advanced Applications
Year:
2006

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Abstract

Recently, on-demand streaming service of continuous media (CM) becomes crucial for successful Internet businesses. To ensure quality service of online CM streams, the Sweep scheme was proposed to provide high I/O throughput as well as hiccup-free playback. When this scheme is applied in the system using the zoned disk, however, it may suffer from significant bandwidth losses because of its inherent scheduling inflexibility. Since disk zones in a multi-zone disk have different data transfer rates, much slack time occurs when data requests are made to read data blocks located in inner disk zones. Such slack time cannot be efficiently reclaimed in Sweep. In this paper we propose an EDF-style variant of the Sweep scheme, called the Dynamic Sweep Scheme, in order to handle slack time that increases in the zoned disk.