vSAN 7.0 Update 2 and later supports Remote Direct Memory Access (RDMA) communication.
RDMA allows direct memory access from the memory of one computer to the memory of another computer without involving the operating system or CPU. The transfer of memory is offloaded to the RDMA-capable Host Channel Adapters (HCA).
vSAN supports the RoCE v2 protocol. RoCE v2 requires a network configured for lossless operation.
Each vSAN host must have a vSAN certified RDMA-capable NIC, as listed in the vSAN section of the VMware Compatibility Guide. Use only the same model network adapters from the same vendor on each end of the connection.
All hosts in the cluster must support RDMA. If any host loses RDMA support, the entire vSAN cluster switches to TCP.
vSAN with RDMA supports NIC failover, but does not support LACP or IP-hash-based NIC teaming.