Product : VMware, vSAN [SDS]/6.7 U1, ROBO Ent
Feature : Network Config, Components, Server Support
Content Owner:  Herman Rutten
Summary
Flexible
Details
2-node ROBO deployments can be connected directly to each other using crossover cables.

For each hardware component the vSAN Hardware Quick Reference Guide and the VMware vSAN Ready Nodes document provide sizing guidelines.