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The architecture of several data centers have been proposed as alternativesto the conventional three-layer one.Most of them employ commodity equipment forcost reduction. Thus, robustness to failures becomes even more important,because commodity equipment is more failure-prone. Each architecture has adifferent network topology design with a specific level of redundancy. In thiswork, we aim at analyzing the benefits of different data center topologiestaking the reliability and survivability requirements into account. We considerthe topologies of three alternative data center architecture: Fat-tree, BCube,and DCell. Also, we compare these topologies with a conventional three-layerdata center topology. Our analysis is independent of specific equipment,traffic patterns, or network protocols, for the sake of generality. We deriveclosed-form formulas for the Mean Time To Failure of each topology. The resultsallow us to indicate the best topology for each failure scenario. Inparticular, we conclude that BCube is more robust to link failures than theother topologies, whereas DCell has the most robust topology when consideringswitch failures. Additionally, we show that all considered alternativetopologies outperform a three-layer topology for both types of failures. Wealso determine to which extent the robustness of BCube and DCell is influencedby the number of network interfaces per server.

Reliability and Survivability Analysis of Data Center Network Topologies