Joint allocation of computing and connectivity resources in survivable inter-datacenter elastic optical networks

Inter-datacenter elastic optical networks (EON) need to provide the service for the requests of cloud computing that require not only connectivity and computing resources but also network survivability. In this paper, to realize joint allocation of computing and connectivity resources in survivable inter-datacenter EONs, a survivable routing, modulation level, spectrum, and computing resource allocation algorithm (SRMLSCRA) algorithm and three datacenter selection strategies, i.e. Computing Resource First (CRF), Shortest Path First (SPF) and Random Destination (RD), are proposed for different scenarios. Unicast and manycast are applied to the communication of computing requests, and the routing strategies are calculated respectively. Simulation results show that SRMLCRA-CRF can serve the largest amount of protected computing tasks, and the requested calculation blocking probability is reduced by 29.2%, 28.3% and 30.5% compared with SRMLSCRA-SPF, SRMLSCRA-RD and the benchmark EPS-RMSA algorithms respectively. Therefore, it is more applicable to the networks with huge calculations. Besides, SRMLSCRA-SPF consumes the least spectrum, thereby exhibiting its suitability for scenarios where the amount of calculation is small and communication resources are scarce. The results demonstrate that the proposed methods realize the joint allocation of computing and connectivity resources, and could provide efficient protection for services under single-link failure and occupy less spectrum.