Date Added: Oct 2009
Peering of Content Delivery Networks (CDNs) allows providers to rapidly scale-out to meet both flash crowds and anticipated increases in demand. Recent trends foster the need for a utility model for content delivery services to provide transparency, high availability, reduced investment cost, and improved content delivery performance. Analysis of prior work reveals only a modest progress in evaluating the utility for peering CDNs. In this paper, the authors introduce a utility model and measure the content-serving ability of the peering CDNs system. The model assists in providing a customer view of the system's health for different traffic types. The model also captures the traffic activities in the system and helps to reveal the true propensities of participating CDNs to cooperate in peering.