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Broadcom-VMware

2V0-622D · Question #27

An administrator notices that a virtual machine running SQL Server is not performing as expected. vmware.log> vmx| W110: NUMA and VCPU hot add are incompatible. Forcing UMA How can the administrator…

The correct answer is A. Power off the virtual machine and disable vCPU hot plug. Enabling vCPU hot plug forces VMware to present a UMA memory topology to the guest OS, disabling NUMA optimization and degrading performance for memory-intensive workloads like SQL Server.

Section 7 – Administer and Analyze vSphere 6.5 Performance

Question

An administrator notices that a virtual machine running SQL Server is not performing as expected. vmware.log> vmx| W110: NUMA and VCPU hot add are incompatible. Forcing UMA How can the administrator resolve this issue?

Options

  • APower off the virtual machine and disable vCPU hot plug.
  • BReinstall VMware Tools.
  • CModify the .vmx file to force NUMA and vCPU hot add to function.
  • DInstallation third party plug-in to enable NUMA and vCPU hot add to function.

How the community answered

(48 responses)
  • A
    77% (37)
  • B
    13% (6)
  • C
    6% (3)
  • D
    4% (2)

Why each option

Enabling vCPU hot plug forces VMware to present a UMA memory topology to the guest OS, disabling NUMA optimization and degrading performance for memory-intensive workloads like SQL Server.

APower off the virtual machine and disable vCPU hot plug.Correct

NUMA optimization and vCPU hot plug are mutually exclusive because enabling hot plug requires the hypervisor to present a flat UMA memory topology to the guest - powering off the VM and disabling vCPU hot plug allows the hypervisor to restore NUMA awareness, resolving the performance issue for the SQL Server workload.

BReinstall VMware Tools.

VMware Tools manages guest OS integration features such as drivers and timekeeping, but it has no ability to resolve a NUMA vs. vCPU hot plug architectural conflict in the hypervisor.

CModify the .vmx file to force NUMA and vCPU hot add to function.

The NUMA and vCPU hot add incompatibility is a fundamental hypervisor design constraint and cannot be overridden by editing the .vmx file.

DInstallation third party plug-in to enable NUMA and vCPU hot add to function.

No third-party plug-in can reconcile the NUMA and vCPU hot add incompatibility, as it is an inherent limitation of how the VMware hypervisor must present hardware topology when hot plug is enabled.

Concept tested: NUMA and vCPU hot plug incompatibility in vSphere

Topics

#NUMA#vCPU hot plug#VM performance#vmware.log

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