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All Optical Reconfigurable Network for Data Centers

Khani, Elham | 2022

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 55279 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Hessabi, Shaahin; Koohi, Somayyeh
  7. Abstract:
  8. The ever-expanding growth of internet traffic enforces deployment of massive Data Center Networks (DCNs) supporting high performance communications. Optical switching is being studied as a promising approach to fulfill the surging requirements of large scale data centers. Data center networks include hundreds of thousands of nodes that require flexible, high bandwidth, and low power infrastructures for their communications. Optical interconnection networks supply the required bandwidth, consuming much lower power compared to their electrical counterparts. The heterogeneous nature of data centers’ traffic needs a flexible network architecture which can be dynamically configured according to varying network traffic. However, most of the proposed reconfigurable optical architectures use single core switches which limit scalability of the network. In this thesis, we propose an All-Optical Reconfigurable Architecture (AORA) which can customize the optical paths according to the varying traffic patterns. Utilizing low radix optical switches, AORA constructs a torus-based topology which can be dynamically partitioned into different clusters. Clusters can be reconfigured to set up new clusters through a new wavelength assignment. Simulations for data centers of sizes 1440 servers and 4000 servers on different traffic loads were performed. Upon our simulation results for two different network scales and two types of traffic patterns, AORA achieves less than 0.2 μs end-to-end delay, which proves AORA delivers very low delay for small to medium data center scales. AORA is more suitable for small to medium scale DCNs. Alternatively, buffer-less Fast Optical Switch (FOS) was proposed to realize the nanosecond switching of optical DCNs. Although FOSs provide nanosecond optical switching, they still suffer from port count limitations to scale the DCN. To address the issue of scaling DCNs to more than two million servers, in this thesis we propose the hyper scale FOS-based L-level DCNs (HFOSL) which is capable of building large networks with small radix switches. The numerical analysis shows that L of 4 is the optimal level for HFOSL to obtain the lowest cost and power consumption. Specifically, under a network size of 160,000 servers, HFOS4 saves 36.2% in cost compared with the 2-level FOS-based DCN, while achieves 60% improvement in cost and 26.7% improvement in power consumption compared with Fat tree. Moreover, a wide range of simulations and analyses demonstrate that HFOS4 outperforms state-of-the-art FOS-based DCNs by up to 40% end-to-end latency under DCN size of 81920 servers.
  9. Keywords:
  10. Reconfigurable Network ; Data Center ; Optical Switching ; Interconnect Network ; All Optical Reconfigurable Network (AORA)

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