Scalable Parallel-Access for Mirrored Servers
Scalable Parallel-Access for Mirrored Servers
复制标题
镜像服务器的可扩展并行访问
DOI：
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复制
发表时间：
2002
期刊：
影响因子：
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通讯作者：
A. Zeitoun
中科院分区：
文献类型：
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作者：
A. Zeitoun
为了在传输大型多媒体文件时提高客户机的感知吞吐量，可以使用并行访问方法同时传输来自不同镜像的文件的不同部分。然而，以前提出的方法要么采用非常激进的实现，但伸缩性差，要么在当前的Internet上存在部署困难。通过跟踪驱动和真实的Internet实验，我们展示了一些以前的并行访问实现的低可伸缩性和性能下降的影响。在本文中，我们提出了一种混合方案(1)最小化所有镜像上的附加负载，同时(2)最大化客户端感知的吞吐量。我们的方案使用基于往返时间（RTT）测量和动态监测的知情镜像选择。当使用不到10%的可用镜像时，我们发现传输时间比传统的单服务器传输减少了85%以上，比其他并行访问实现减少了35%。关键词：互联网工具，应用程序，并行下载，文件传输，镜像选择。
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 show the effect of poor scalability 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 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.