CPU and memory sizes for SAP HANA VMs
-
With the NUMA architecture, each CPU in a server (NUMA node) has local memory assigned but can also access the nonlocal memory assigned to the other CPUs on the server. Because access to local memory is faster, we recommend configuring SAP HANA production VMs with the NUMA architecture in mind to avoid access to nonlocal memory.
The following table provides guidelines for configuring vCPU and memory for an SAP HANA production VM:
Table 2. Configuration guidelines for vCPU and memory for an SAP production VM
SAP HANA VM size
vCPU (cores)
Memory
Maximum number of SAP HANA VMs per host
Small (half-socket)
50 percent of the cores of a NUMA node
Two-socket: 25 percent of the total RAM of the server
Four-socket:12.5 percent of the total RAM of the server
Two-socket host: 2
Four-socket: 6
Medium (full-socket)
100 percent of the cores of a NUMA node
Two-socket: 50 percent of the total RAM of the server
Four-socket: 25 percent of the total RAM of the server
Two-socket: 1
Four-socket: 3
Large (four-socket only)
All cores of two NUMA nodes
50 percent of the total RAM of the server
Four-socket: 1
X-Large (four-socket only)
All cores of three NUMA nodes
75 percent of the total RAM of the server
Four-socket: 1
Example:
A physical four-socket PowerEdge R840 server has a fully populated memory configuration with:
- 48 x 128 GB DIMMs (6 TB RAM), as shown in Figure 3.
- Intel Xeon Platinum 8180M CPUs with 28 cores per socket
The following table described the production SAP HANA VM sizes that are recommended:
Table 3. Recommended SAP HANA VM sizes
VM
Configuration
Small
14 vCPUs, 1 socket, 768 GB RAM
Medium
28 vCPUs, 1 socket, 1,536 GB RAM
Large
56 vCPUs, 2 sockets (28 cores per socket), 3,072 GB RAM
X-Large
84 vCPUs, 3 sockets, (28 cores per socket), 4,608 GB RAM
The following figure shows a four-node PowerFlex cluster with the supported SAP HANA VM deployment options.
- Server 1 hosts a single X-Large SAP HANA VM using three sockets (NUMA nodes) and 75 percent of the available memory.
- Server 2 hosts one large and one medium VM.
- Server 3 hosts small half-socket VMs.
Note: The the SAP HANA VMs must use either full-sockets or half-sockets. Configurations with 1.5 or 2.5 sockets are not allowed.
Figure 10. Four-node PowerFlex cluster with SAP HANA VM deployment options