A VxRail cluster can have a minimum of three nodes and as many as 64 nodes. If you are running SAP HANA in production on a VxRail cluster, a minimum of four nodes is strongly recommended to avoid an availability and performance impact when nodes become unavailable, for example, during software upgrades.
When sizing a VxRail cluster for SAP HANA, consider having enough free resources (standby nodes) available for smooth upgrades or for situations where VMware HA must migrate VMs to available nodes if a VxRail node fails.
The following table shows Dell Technologies’ sizing recommendations for a VxRail cluster for SAP HANA:
Table 6. Recommended VxRail standby nodes
Number of VxRail nodes required for SAP HANA | Recommended nnumber of additional standby nodes |
3–7 | 1 |
8–14 | 2 |
15–21 | 3 |
22–28 | 4 |
29–35 | 5 |
36–42 | 6 |
43–49 | 7 |
50–56 | 8 |