Community-based complex cloud data center

• Newly proposed community based scale-free data center network topology model (CSF).
• Growing CSF has high bandwidth and small diameter, is resilient and cost effective.
• Presented performance analysis of both homogeneous and heterogeneous networks.
• Bisectional bandwidth of scale-free networks is proportional to the number of nodes.
• Proposed techniques for placing a group of VMs or stand-alone web server replicas.

The communication infrastructure is a critical component of a large-scale cloud data center. It needs to provide the best performance available while keeping overprovisioning and, lately even more important, power consumption, to the minimum. Aiming to provide a unified solution that will have high performance together with economical benefits and power consumption reduction, in this paper, we propose a new community-based scale-free model for data center network architecture. By comparing the proposed model to other similar solutions we show that the performance of the network in terms of average path length, bandwidth and resilience is similar to the state-of-the-art models. In our presented detailed analysis of the model properties, our focus is set on exploring how heterogeneity in terms of different type of network equipment influences the basic network properties. We also present solutions and network metrics that can be used in conjunction to the introduced community structure in order to additionally increase the performance.