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 r

The correct answer is A. Power off the virtual machineand disable vCPU hot plug.. The vmware.log warning 'NUMA and VCPU hot add are incompatible. Forcing UMA' means vCPU hot add (hot plug) is enabled on the VM, which forces VMware to disable NUMA optimization and fall back to UMA (Uniform Memory Access). NUMA-aware scheduling is critical for SQL Server perform

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 machineand 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

(39 responses)

A
82% (32)
B
5% (2)
C
3% (1)
D
10% (4)

Explanation

The vmware.log warning 'NUMA and VCPU hot add are incompatible. Forcing UMA' means vCPU hot add (hot plug) is enabled on the VM, which forces VMware to disable NUMA optimization and fall back to UMA (Uniform Memory Access). NUMA-aware scheduling is critical for SQL Server performance on multi-socket systems. To restore NUMA optimization, the administrator must power off the VM and disable vCPU hot plug in the VM settings. This cannot be done while the VM is running. Reinstalling VMware Tools, editing the .vmx to force compatibility, or using third-party plugins will not resolve this fundamental architectural conflict.

Topics

#NUMA#vCPU hot-plug#performance tuning#VM configuration

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