تجزیه و تحلیل عملکرد از طراحی مقیاس پذیر برای تکثیر مجموعه های فایل در شبکه های وسیع
|کد مقاله||سال انتشار||مقاله انگلیسی||ترجمه فارسی||تعداد کلمات|
|27530||2000||18 صفحه PDF||سفارش دهید||6549 کلمه|
Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Journal of Network and Computer Applications, Volume 23, Issue 3, July 2000, Pages 201–218
Mirroring file collections in the global Internet is widely practiced with a recent study estimating the number of WWW hosts with mirrored content at 10% of all WWW hosts. Conventional mirroring tools, however, are not well-suited for the large-scale multiple-site replication services envisioned by projects such as the Internet2 Distributed Storage Infrastructure (I2-DSI) project. This paper presents a scaleable design for the automated synchronization of large collections of files replicated across multiple hosts, as in I2-DSI, and outlines of how the design has been realized using rsync+, a modification to the popular open-source mirroring tool, rsync. A performance study based on an instrumented mirror usingrsync + empirically characterizes server-side processing costs under realistic, large-scale workloads, and supplementary measurements of network throughput across Internet2 links illustrate the achievable network performance in a high-speed wide-area network. These experimental results confirm the validity of scalability arguments for the design, uncover key system parameters for rsync+ that must be tuned for efficient operation, and indicate the limitations of TCP-only transport solutions as the number of mirror sites grows.