Interesting bit of info on the second to last slide here: https://www.cisco.com/c/dam/global/da_dk/assets/training/seminaria-materials/Nexus.pdf   Shows that the roadmap is for the 93180YC-FX in NX-OS mode is to support 16GB FC Switch mode in the sec...

  If you go to this datasheet, you'll see that they support FC... https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-series-switches/datasheet-c78-738259.html   If you go to this datasheet, you'll see that there is a footnote '[1]'...