Conference paper Open Access

Collisions Free Scheduling in the NEPHELE Hybrid Electrical/Optical Datacenter Interconnect

K. Christodoulopoulos; K. Kontodimas; A. Siokis; K. Yiannopoulos; E. Varvarigos

 The NEPHELE datacenter network is divided into pods/clusters of racks and relies on hybrid electro-optical top-of rack  switches  that  access  an  all-optical  network  consisting  of WDM  rings.  To  enable  dynamic  and  efficient  sharing  of  the optical  resources  and  a  collision-free  network  operation,  the NEPHELE  network  is  envisioned  to  be  operated  in  a  slotted TDMA  manner  with  a  software-defined-network  (SDN)  based control  plane.  We  describe  the  NEPHELE  resource  allocation problem,  describe the wavelength conflicts on the shared  WDM rings,  translate  those  into  resource  allocation  constraints  and discuss   on   the   effect   of   these   constraints   on   the   network performance.  To  do  so,  we  define  the  worst-case  traffic  and perform  simulations  to  evaluate  their  effect  on  average  traffic. Finally,  we  propose  a  variation  to  the  NEPHELE  architecture that reduces the effects of these wavelength conflict constraints. 

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