Ashok Anand

Understanding Data Center Traffic Characteristics

By: 
Theophilus Benson, Ashok Anand, Aditya Akella, and Ming Zhang
Appears in: 
CCR January 2010

As data centers become more and more central in Internet communications, both research and operations communities have begun to explore how to better design and manage them. In this paper, we present a preliminary empirical study of end-to-end traffic patterns in data center networks that can inform and help evaluate research and operational approaches. We analyze SNMP logs collected at 19 data centers to examine temporal and spatial variations in link loads and losses. We find that while links in the core are heavily utilized the ones closer to the edge observe a greater degree of loss.

SmartRE: An Architecture for Coordinated Network-wide Redundancy Elimination

By: 
Ashok Anand, Vyas Sekar, and Aditya Akella
Appears in: 
CCR October 2009

Application-independent Redundancy Elimination (RE), or identifying and removing repeated content from network transfers, has been used with great success for improving network performance on enterprise access links. Recently, there is growing interest for supporting RE as a network-wide service. Such a network-wide RE service benefits ISPs by reducing link loads and increasing the effective network capacity to better accommodate the increasing number of bandwidth-intensive applications.

Packet Caches on Routers: The Implications of Universal Redundant Traffic Elimination

By: 
Ashok Anand, Archit Gupta, Aditya Akella, Srinivasan Seshan, and Scott Shenker
Appears in: 
CCR October 2008

Many past systems have explored how to eliminate redundant transfers from network links and improve network efficiency. Several of these systems operate at the application layer, while the more recent systems operate on individual packets. A common aspect of these systems is that they apply to localized settings, e.g. at stub network access links. In this paper, we explore the benefits of deploying packet-level redundant content elimination as a universal primitive on all Internet routers. Such a universal deployment would immediately reduce link loads everywhere.

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