Simple Question:
Which Dell switches are supported for a Storage Spaces Direct deployment:
I am looking for a basic solution, so I do not plan on doing RDMA.
RDMA is not required by Windows 2016 S2D according to this Claus Jorgensen blog: 
Quote: "I often get the question “Is RDMA required for Storage Spaces Direct”. The answer to this question is: no.".
I understand that 10Gb IS a requirement of S2D. But are there others?
More specifically: Will an X4012 (or two for fault tolerance) work for a 2-node S2D cluster?