Joint problem of bandwidth allocation and VM-placement in optical-electrical DC.

Challenges: (i) limited reachability due to the size of the optical switch in the datacenter netework, (ii) dynamic creation of optical paths lead to the creation of constrained optical network topology.

The problem is formulated as nonlinear optimization problem, that is NP-hard in nature.

Input requests from users are abstracted as virtual networks, where a single node in a virtual network is a cluster of VMs, and an edge connecting two nodes is the bandwidth demand between the two clusters of VMs.

Three algorithms are developed for embedding input virtual networks on hybrid datacenter network, and their performances are evaluated using simulations.