VCP-DCV vSphere Performance and Scaling Practice Question
An administrator configures a VM with 4 vCPUs and 32 GB memory on a host with 128 GB RAM and 8 cores (HT enabled). The VM runs a database that requires high memory bandwidth. Performance monitoring shows low CPU usage but high memory latency. Which configuration change is most likely to improve memory performance?
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
✓
Enable the 'Preferred NUMA Node' VM option
Preferred NUMA Node allows the VM to be pinned to a specific NUMA node, reducing cross-node memory access. Option B is wrong; increasing reservation does not improve latency. Option C is wrong; disabling HT reduces overall throughput. Option D is wrong; more vCPUs may increase contention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable the 'Preferred NUMA Node' VM option
Why this is correct
Preferred NUMA Node forces the VM to run on a single NUMA node, ensuring local memory access and reducing latency.
- ✗
Increase the memory reservation to 64 GB
Why it's wrong here
Reservation ensures physical memory but does not affect memory latency or NUMA locality.
- ✗
Disable Hyper-Threading on the host
Why it's wrong here
Disabling HT reduces logical CPUs and may increase contention, but does not directly improve memory latency.
- ✗
Increase the number of vCPUs to 8
Why it's wrong here
Adding vCPUs can increase scheduling contention and may worsen performance, especially if memory bandwidth is already a bottleneck.
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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.