RoCE (RDMA over Converged Ethernet) with VxRail based on PowerEdge14G

That's a good question.  Up until the new VxRail nodes supporting the 25 Gbps Broadcom NICs, only Intel NICs were available on VxRail, none of which support RoCE (I'm not aware of any Intel NICs that support RoCE on VMware).  The newly-introduced VxRail nodes with 25 Gbps NICs come with the Broadcom BCM57414, which technically does support RoCE, and is certified with RoCE v1 and v2 on vSphere 6.5U2 according to the VMware HCL.  However, the specific driver and firmware versions listed in the VMware HCL for RoCE support don't match the VxRail Support Matrix, and I've never seen a support statement around using RoCE with vSAN (any version).  In order to have a fully supported configuration with RoCE, I would think you'd need both the Broadcom BCM57414 NIC as well as official support on the VxRail Support Matrix document (and possibly explicit support from VMware vSAN), not to mention switches that support RoCE and are properly configured for RoCE (which is the hard part).  Since RoCE is pretty bleeding edge right now I wouldn't expect to see this soon, but I would imagine we'll see it sometime down the road... probably with vSAN Ready Nodes first and then VxRail shortly afterwards (that would be my best guess).

Thanks Bill