Thanks for the detailed reply. I found a QSFP+ DAC that says it supports IB and Ethernet.
I don’t have enough computers to set up a fabric, only the 2 I would be direct attaching have PCIE slots.

I’ve never used infiniband before so my reason for wanting to try it is just to learn what it is, and how it works. That said, some of those use-cases look very interesting, especially transporting NVMe namespaces, I didn’t know that was possible.

I like to have different naming schemes for different device classes.
Desktop computers: Greek gods
Laptops: Elements of the periodic table
Cloud servers: Norse gods
Home servers: Planets of the solar system
Raspberry Pis: Greek titans