Definition

vNUMA (virtual NUMA)

vNUMA (virtual non-uniform memory access) is a memory-access optimization method for VMware virtual machines (VMs) that helps prevent memory-bandwidth bottlenecks

The vNUMA hypervisor creates a NUMA topology that closely mirrors the underlying physical server topology, allowing guest operating systems to intelligently access memory and processors. A VM's vNUMA topology will mimic the topology of the host on which it starts; this topology does not adjust if a VM moves to a different host.

Virtual NUMA is especially useful with large, high-performance virtual machines or multiple VMs in a vApp. With vNUMA awareness, the VM's memory and processing power are allocated based on the underlying NUMA topology even when it spans more than one NUMA node. vNUMA-aware VMs must be hardware version 8 or newer and operate on vSphere 5.0 or newer, with NUMA-enabled hardware. 

If a VM has more than eight vCPUs, vNUMA is automatically enabled. The VMware admin can adjust virtual NUMA topology for a VM, or enable vNUMA awareness on a smaller VM, using advanced configuration settings.VMs using many virtual CPUs (vCPUs) are more likely to access more than one NUMA node (local memory tied to a processor) on the underlying physical server.

Contributor(s): Meredith Courtemanche
This was last updated in June 2013
Posted by: Margaret Rouse

Email Alerts

Register now to receive SearchVMware.com-related news, tips and more, delivered to your inbox.
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

More News and Tutorials

Do you have something to add to this definition? Let us know.

Send your comments to techterms@whatis.com

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to: