Grenoble:Network

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Overview of Ethernet network topology

GrenobleNetwork.png


Network devices models

  • gw: Dell S5296F-ON

More details (including address ranges) are available from the Grid5000:Network page.

HPC Networks

Infiniband 100G network

An Infiniband 100G network interconnects nodes from the drac cluster. It has a single switch.

  • Switch: Mellanox SB7700 IB EDR / 100G
  • Host adapter: Mellanox MT27700 [ConnectX-4] dual-port
  • Each of the 12 drac nodes has two 100G connections to the switch

Omni-Path 100G network

Nodes of the dahu, yeti and troll clusters are connected to Omni-Path switches (Intel Omni-Path 100Gbps), beside the Ethernet network.

This Omni-Path network interconnects both the Grid'5000 Grenoble nodes and the nodes of the HPC Center of Université Grenoble Alpes (Gricad mésocentre).

The topology used is a fat tree with a 2:1 blocking factor:

  • 2 top switchs
  • 6 leaves: switchs with 32 downlinks to nodes and 8 uplinks to each of the two top switches (48 ports total)

All 32 dahu nodes are connected to a same leaf. The 4 yeti and 4 troll nodes are connected to another leaf.

Other ports are used by nodes of the HPC center of UGA.

G5k-grenoble-network-opa.png


A generated topology (using the output of opareports -o topology :

Grenoble-DC-IMAG-OPA.svg

IP Range

  • Computing : 172.16.16.0/20
  • Omni-Path : 172.18.16.0/20
  • Virtual : 10.132.0.0/14