These results, therefore, indicate the need to link the network resource management with new datacentre network architectures.Ī simplified segment of the all-optical network architecture is shown in Figure 1, where six of the ToR switches are organised into two clusters. A number of simple scheduling mechanisms were investigated and the results show that an on-demand scheduling mechanism could deliver a throughput increase of more than ∼50% without any increase in total installed network capacity. An extensive emulated study is presented which indicates that the reconfiguration of such a network can have a detrimental impact on Transmission Control Protocol (TCP) congestion control mechanisms that can degrade the performance of the system. In this study, a generalised network model that emulates the behaviour of these types of network was developed but where the total capacity is maintained constant so that system behaviour can be understood. In most cases, additional capacity was added to the system which unsurprisingly improved performance. A number of new architectures for data centre networks employing reconfigurable, SDN controlled, all-optical networks have been reported in recent years.

Tor switch hadoop