1. Schedulers for Hybrid Data Center Network Neelakandan Manihatty Bojan 2 nd Year PhD Student Advisor: Dr. Andrew W. Moore Eurosys Doctoral Workshop, 18 th April 2016

2. Schedulers for Hybrid Data Center Network Problem:  Designing scalable and cost effective Data Center Networks (DCN) for future.

3. Packet Switching & Circuit Switching Hybrid DCN = Packet Switching + Circuit Switching

4. Schedulers for Hybrid Data Center Network Problem:  Designing scalable and cost effective Data Center Networks (DCN) for future. Motivation:  DCN require more Bandwidth, better energy efficiency.  Hybrid DCNs (with dynamic Hybrid schedulers) are needed.

5. Our Approach: Flow classification at Host

6. Flow transition

7. Summary  Hybrid networks are essential to meet requirements of future DCN.  Need dynamic schedulers for hybrid networks.  Ideas for the dynamic hybrid scheduler:  Flow classification at host  Flow transition  Evaluation through simulation and implementation (NetFPGA).  HyNS: a Hybrid Network Simulator. email: nm525@cl.cam.ac.uk

8. Backup slides

9. EPS Vs OCS Has buffers, TCAM Arista ToR switch (48x10G and 4x40G) has a power consumption of 400 W. There is packet processing No buffers Glimmerglass OCS with 192x192 optical cross-connect has a power consumption of 85 W. No packet processing

10. Case for hybrid switching Consider 130,000 node data center using EPS with folded Clos topology. Increase maintenance and ToR (262144 switch ports) Power consumption = 262144* 2 W = 524 KW Aggregation (262144 switch ports) Power consumption = 262144* 2 W = 524 KW Core (131072 switch ports) Power consumption = 131072* 2 W = 262 KW Total Power consumption of transceivers alone1.3 MW

11. Packet Switching & Circuit Switching Hybrid DCN = Packet Switching + Circuit Switching

12. Traditional Fat Tree topology ……… TOR 1 TOR N ……… Core switch Aggregation Switch K Aggregation Switch 1 TOR 1 TOR N Server 1 Server N Server 1 Server N Server 2.. …..

13. Hybrid Network

14. HyNS: Hybrid Network Simulator