Scalable Parallel-Access for Mirrored Servers

A. Zeitoun, H. Jamjoom, M. El-Gendy (USA)

Keywords

Parallel Downloading, File Transfer, Mirror Selection.

Abstract

To increase a client’s perceived throughput while transfer ring 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 difficul ties on the current Internet. Using trace-driven and real Internet experiments, we show the effect of poor scalabil ity and performance degradation for some of the previous parallel-access implementations. In this paper, we propose a hybrid scheme that (1) minimizes the added load on all mirrors while (2) maximizing the client-perceived through put. 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.

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