VCP-DCV vSphere Performance and Scaling Practice Question
A large VM with 24 vCPUs is deployed on a dual-socket host with two NUMA nodes each having 12 cores. Which step is a BEST PRACTICE to ensure optimal performance for this VM?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Leave vNUMA enabled and ensure the VM has enough memory to span two nodes.
Setting vNUMA controls exposes the NUMA topology to the guest OS, allowing it to optimize memory locality. By default, vNUMA is enabled for VMs with more than 8 vCPUs. Placing the VM on a single NUMA node would limit resources. Disabling hyperthreading is unnecessary. Setting CPU affinity reduces flexibility.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable hyperthreading on the host to reduce contention.
Why it's wrong here
Disabling hyperthreading reduces total CPU capacity and is not a best practice for large VMs.
- ✗
Assign all vCPUs to a single NUMA node using CPU affinity.
Why it's wrong here
Pinning vCPUs to a single NUMA node limits performance and reduces scheduling flexibility.
- ✓
Leave vNUMA enabled and ensure the VM has enough memory to span two nodes.
Why this is correct
vNUMA ensures the guest OS can optimize memory access across NUMA nodes, improving performance.
- ✗
Set the VM memory reservation to zero to allow transparent page sharing.
Why it's wrong here
Memory reservation does not relate to NUMA performance; transparent page sharing is unrelated.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This VCP-DCV practice question is part of Courseiva's free VMware certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the VCP-DCV exam.