Scalable Parallel-Access for Mirrored Servers

Amgad Zeitoun, Hani Jamjoom and Mohamed El-Gendy

IASTED International Multi-Conference on Applied Informatics (AI)

Innsbruck, Austria, Feburary 2002

Abstract. To increase a client’s perceived throughput while transferring large multimedia ﬁles, a parallel-access approach can be used to simultaneously transfer different pieces of a ﬁle from different mirrors. Previously proposed approaches, however, either employ very aggressive implementations with poor scalability or suffer from deployment difﬁculties on the current Internet. Using trace-driven and real Internet experiments,we showthe effect ofpoor scalability andperformance degradation for some oftheprevious parallel-access implementations. Inthispaper, we propose a hybrid scheme that (1) minimizes the added load on all mirrors while (2) maximizing the client-perceived throughput. Our scheme uses informed mirror selection based on round-trip time (RTT) measurements as well as dynamic monitoring. While using less than 10% of the available mirrors, we show a decrease in transfer time by more than 85% over traditional single-server transfers and 35%over other parallel-access implementations.

Keywords. Internet Tools, Applications, Parallel Downloading, File Transfer, Mirror Selection

Link. /publications/jamjoom-istad-02.pdf

Bibtex.

@inproceedings{jamjoom-istad-02,
author = {Amgad and Zeitoun and Hani and Jamjoom and Mohamed and El-Gendy},
title = {{Scalable Parallel-Access for Mirrored Servers}},
booktitle = {IASTED International Multi-Conference on Applied Informatics (AI)},
address = {Innsbruck, Austria},
month = {Feburary},
year = {2002}
}