VCP-DCV vSphere Performance and Scaling Practice Question
A vSphere administrator is troubleshooting a VM that is experiencing excessive disk latency. The VM is on a datastore accessed via NFS over a 1GbE network. The host shows high network utilization. Which action should be taken to improve performance?
⚠ Common exam trap
It's easy for candidates to assume Storage I/O Control (SIOC) can solve any storage latency issue, but SIOC only manages contention at the storage array level, not network bandwidth limitations, which is the actual bottleneck in this NFS scenario.
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
✓
Upgrade the network link to 10GbE or enable multiple NICs with teaming.
The VM is experiencing excessive disk latency due to high network utilization on the 1GbE link. Since NFS storage traffic is entirely network-bound, upgrading to 10GbE or enabling multiple NICs with teaming increases the available bandwidth, reduces congestion, and directly addresses the root cause of the latency. This is the most effective action because the bottleneck is at the network layer, not the storage protocol or VM configuration.
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 Storage I/O Control on the datastore.
Why it's wrong here
SIOC does not increase network capacity.
- ✗
Convert the datastore from NFS to VMFS.
Why it's wrong here
VMFS is not applicable to NFS; it uses iSCSI or FC.
- ✗
Increase the memory reservation for the VM.
Why it's wrong here
Memory does not affect disk latency.
- ✓
Upgrade the network link to 10GbE or enable multiple NICs with teaming.
Why this is correct
Higher bandwidth reduces latency and congestion.
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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.