Delay Tolerant Bulk Data Transfers on the Internet or how to book some terabytes on "red-eye" bandwidth
Speaker: Nikolaos Laoutaris, Telefonica Research.
Date: 24 October 2008 Time: 12:00-13:30
Location: "Mediterranean Studies" Seminar Room, FORTH. Heraklion, Crete.
Host: Maria Papadopouli


Many emerging scientific and industrial applications require the capability to transfer large quantities of data, ranging from tens of terabytes to petabytes. Examples include the transport of high definition movies between studios and theaters, and the transport of large quantities of data from telescopes and particle accelerators/colliders to laboratories all around the world. A convenient property of many of these applications is their ability to tolerate delivery delays from a few hours to a few days. Such Delay-Tolerant Bulk (DTB) transfers are currently being serviced through the use of the postal system to transport hard drives and DVDs, or though the use of expensive dedicated networks.

In this work we have used traffic data from 200+ links of a large transit ISP to show that the naive approach of using end-to-end (E2E) connection oriented transfers can be prohibitively expensive under widely used 95-percentile charging schemes. We have also conducted extensive live measurements across multiple ISPs to show that the available bandwidth of E2E connections is subject to time-of-day effects.

Based on these observations, we proceed to design a system for performing Store-and-Forward transfer of DTB data. We evaluate the performance of our system under two scenarios: (1) 95-percentile charging, (2) flat-rate charging under time-of-day capacity constraints.


Nikolaos Laoutaris is a research scientist at Telefonica Research, Barcelona. Prior to that he was a postdoc fellow at Harvard University and a Marie Curie postdoc fellow at Boston University. He holds a Ph.D. degree in Computer Science from the University of Athens, Greece (2004). His main research interests go into algorithmic and the performance evaluation issues of content distribution networks, overlay routing systems, peer-to-peer networks, and multimedia streaming systems. More information can be found at: http://research.tid.es/nikos/

* This talk is based on joint work with: Hitesh Ballani (Cornell), Pablo Rodriguez (Telefonica Research), Georgios Smaragdakis (BU), and Ravi Sundaram (Northeastern).

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