Dynamic resource allocation in hybrid optical-electrical datacenter networks

作者：Divakaran Dinil Mon; Hegde Soumya; Srinivas Raksha; Gurusamy Mohan

来源：Computer Communications, 2015, 69: 40-49.

DOI：10.1016/j.comcom.2015.07.008

• Datacenter
• Bandwidth
• Optical
• Embedding
• Virtual network

A promising development in the design of datacenters is the hybrid network architecture consisting of both optical and electrical elements, in which end-to-end traffic can be routed through either an electrical path or an optical path. The core optical switch is used to dynamically create optical paths between pairs of electrical edge-switches in such a datacenter network. In this context, the joint problem of bandwidth allocation and VM-placement poses new and different challenges not addressed yet in hybrid datacenter. In particular, we foresee two issues: (i) the number of edge-switches that can be simultaneously reached using optical paths from an edge-switch is limited by the size of the optical switch, (ii) the dynamic creation of optical paths can potentially establish a constrained optical network topology leading to poor performance. In this work, we abstract the requests of tenants as virtual networks, and study the problem of embedding virtual networks on a hybrid datacenter. We formulate the problem as a non-linear optimization problem and analyze its complexity. We develop and analyse three algorithms for embedding dynamically arriving virtual network demands on a hybrid optical-electrical datacenter. Through simulations, we demonstrate the effectiveness of not only exploiting the already established optical paths, but also of using electrical network in embedding requests of virtual networks.

• 出版日期2015-9-15