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Both, the GPU (green) and Genoa (red) sub-network have a Fat Tree topology.
2 spine switches (grey) provide access are linked to 6 storage gateways (Lenovo ThinkSystem SR630 V2) of the “IBM Spectrum Scale” (GPFS-)File Systems (/: home, / scratch, / sw).
A pair of two Genoa compute nodes share one 400Gb/s NIC. Hence, per node the effective bandwidth is 200Gb/s (like in the GPU cluster).0
14 LNET gateway servers provide access to the OPA network of the CLX cluster.
Mellanox (acquired by Nvidia) designs/manufactures InfiniBand components.