Dell Technologies strongly recommends configuring the VxRail nodes with four 25 GbE SFP28 ports to support the SAP HANA bandwidth requirements, vSAN traffic, vMotion traffic, and the SAP HANA application network traffic—the SAP HANA internode. Although 10 GbE network configurations are also supported, these configurations provide limited network and storage performance. This limitation might result in longer SAP HANA database restart times and a smaller number of SAP HANA VMs that can be supported in the cluster.
With two or more SAP HANA VMs on any VxRail node, a 25 GbE network for vSAN is required to meet the SAP storage performance requirements.
In addition to the system networks that are required for vSphere and vSAN software, configure the following networks for SAP HANA. Include system replication if the corresponding function (SAP HANA system replication) is used:
Dell Technologies recommends creating a vSphere distributed switch (VDS) for the networks that are required for SAP HANA. Assign 2 x 25 GbE (or 2 x 10 GbE) network ports 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 the 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 information about network configuration for the SAP HANA solution on VxRail infrastructure, see Network considerations.