To support the SAP HANA bandwidth requirements, Dell EMC recommends configuring the VxRail nodes with two 25 GbE SFP28 network daughter cards (NDCs) and an additional two 25 GbE SFP28 connectivity cards for SAP HANA-specific application network traffic―the SAP HANA internode. Although 10 GbE network configurations are also supported, they provide limited network and storage performance, which might result in longer SAP HANA database restart times.
In addition to the system networks required for vSphere and vSAN software, configure the following networks for SAP HANA when the corresponding function (SAP HANA system replication) is used:
Dell EMC recommends creating a new vSphere distributed switch (VDS) for the networks required for SAP HANA and assigning the additional 2 x 25 GbE (or 2 x 10 GbE) network cards as uplinks to this new distributed switch. To meet the performance requirements of the SAP HANA internode network communication, set an MTU size of 9,000 on this distributed switch and in the operating system network settings of the SAP HANA VM for the internode network. Follow VMware and SAP HANA requirements and best practices when configuring networks on the VxRail distributed switch. For detailed information and considerations for planning logical and physical VxRail networks, see the Dell EMC VxRail Network Guide.