Friday, January 10, 2020

Help with cabling

Hi all, I have a pair of Mellanox MCX353A-FCBT coming my way.

I want to setup a point to point (no switch) 40Gbe link between a workstation and server.

I was digging through documentation and came across this: https://www.mellanox.com/related-docs/prod_cables/PB_MC22061xx-00x_MC22071xx-0xx_MC22101xx-00x_MCP170L-F0xx_MCP1700-B0xxx_56Gbps_QSFP+_DAC.pdf

I am kinda confused about the description column.

Do some cables support VPI and Infiniband, and others support ethernet only?

For example:

MC2210126-005 Mellanox® passive copper cable, ETH 40GbE, 40Gb/s, QSFP, 5m

If I buy this and setup 40GbE can I not do infiniband with the same cable?

MC2207126-004 Mellanox® passive copper cable, VPI, up to 56 Gb/s, QSFP, 4m

If I buy this can I do ethernet via VPI but not infiniband?

MC2206125-007 Mellanox® passive copper cable, IB QDR, 40 Gb/s, QSFP, 7m

If I buy this am I relegated to only infiniband?

Thanks, and sorry if this is obvious... I am very new to the hardware here.



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