An administrator has a virtual machine configured with the following settings:
ESXi version: 5.1 CPU: vCPUs 6
Memory: 48GB
Hardware version: 7
VMware Tools: Installed
Which two actions must the administrator take in order to utilize vNUMA? (Choose two.)
A. Upgrade the ESXi host to vSphere 5.5 or later.
B. Upgrade to Virtual Hardware version 8.
C. Configure numa.vcpu.min to 5
D. Configure numa.vcpu.min to 6
Correct Answer: BC
Explanation/Reference:
Explanation:
Using Virtual NUMA vSphere 5.0 and later includes support for exposing virtual NUMA topology to guest operating systems, which can improve performance by facilitating guest operating system and application NUMA optimizations.
Virtual NUMA topology is available to hardware version 8 virtual machines and is enabled by default when the number of virtual CPUs is greater than eight. You can also manually influence virtual NUMA topology using advanced configuration options.
You can affect the virtual NUMA topology with two settings in the vSphere Client: number of virtual sockets and number of cores per socket for a virtual machine. If the number of cores per socket (cpuid.coresPerSocket) is greater than one, and the number of virtual cores in the virtual machine is greater than 8, the virtual NUMA node size matches the virtual socket size. If the number of cores per socket is less than or equal to one, virtual NUMA nodes are created to match the topology of the first physical host where the virtual machine is powered on.
Reference:
https://pubs.vmware.com/vsphere-51/index.jsp#com.vmware.vsphere.resmgmt.doc/GUID-17B629DE-75DF-4C23-B831-08107007FBB9.html
————–Explanation note———————–
Also, Check Page 21,22 https://www.vmware.com/pdf/Perf_Best_Practices_vSphere5.1.pdf
D-) Size your virtual machines so they align with physical NUMA boundaries. For example, if you have a host system with six cores per NUMA node, size your virtual machines with a multiple of six vCPUs (i.e., 6 vCPUs, 12 vCPUs, 18 vCPUs, 24 vCPUs, and so on). Hence answer is D Also, Check Page 41,42 https:// www.vmware.com/pdf/Perf_Best_Practices_vSphere5.1.pdf
