Home » VMware » 2V0-621 v.2 » Which two options would alleviate the observed performance problem for Email-Prod?
Users are reporting CPU related performance problems on the virtual machine Email-Prod throughout the day.
The resource settings for the VM and the ESXi host the VM is running on are shown below:
VM:
Email-Prod vCPUs: 4 Memory: 96GB ESXi host:
CPU: 2 x 8 Core Processors Memory: 128GB
NUMA architecturE. 2 Nodes
Which two options would alleviate the observed performance problem for Email-Prod? (Choose two.)
A. Enable the advanced parameter Numa.PageMigEnable.
B. Enable the advanced parameter Numa.AutoMemAffinity.
C. Enable CPU affinity to separate 2 vCPUs for each NUMA node.
D. Enable CPU affinity to bind all vCPUs to one NUMA node.
Correct Answer: BC
Explanation/Reference:
Explanation: B-) Memory
You can change the amount of RAM that a VM will use like this memsize = "128"
If you don’t assign a value for memory VMware will use the default-setting which is 32MB memsize = "32"
Whenever you assign RAM manually make sure the value is a multiple of 4 – otherwise the VM will not start:
memsize = "255" causes this error-message:
Memory size 255 not a multiple of 4
https://pubs.vmware.com/vsphere-60/index.jsp#com.vmware.vsphere.hostclient.doc/GUID-99E66B59-53A8-42D0-A08F-17DBE7D4A864.html?resultof= %2522
C-) This is expected behavior based on the current architecture of the scheduler. However, these points help to limit the impact of the issue :Lower the number of vCPUs.
From the example above, you would lower the number of vCPUs from 8 to 6 or less. If the virtual machines are sized such that they are a whole multiple or divisor of the NUMA node size, this helps with the number of virtual machines that you can power on. If 6 vCPU virtual machines are used, you can run up to at least 8 of those virtual machines (with 100% CPU utilization) without incurring substantial ready times. https://www.vmware.com/files/pdf/…/VMware-PerfBest-PracticesvSphere6-0.pdf