The Dell EMC Solutions for Azure Stack HCI scalable architectures support from 2 to 16 nodes in a cluster. The scalable architectures support fully converged and non-converged network topologies.
The Dell EMC Solutions for Azure Stack HCI consists of two top-of-rack network switches that provide high availability by connecting the nodes to two separate network switches and implementing Switch Embedded Teaming (SET). When you are using Remote Direct Memory Access over Converged Ethernet (RoCE), you must configure data center bridging (DCB) in both fully converged and non-converged topologies. DCB provides enhancements to the Ethernet protocol, which improves the functionality of data center networks. To take advantage of the Mellanox RoCE network adapters, Priority Flow Control (PFC) and Enhanced Transmission Selection (ETS) are required. PFC and ETS must be configured on all nodes and all network switches interconnecting the nodes.