VCP-DCV vSphere Performance and Scaling Practice Question
A vSphere administrator notices that a VM running a critical database is experiencing high latency on its virtual disk. The VM uses a VMDK on a datastore shared by several other VMs. The datastore is backed by an all-flash array. Which action would best reduce latency without increasing storage capacity?
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 Storage I/O Control (SIOC) on the datastore
Storage I/O Control (SIOC) can enforce I/O shares and limits to prioritize latency-sensitive VMs. Increasing shares or limits may not reduce latency if the array is saturated. Moving to another datastore may not be feasible.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the virtual disk shares for the VM
Why it's wrong here
Increasing shares only provides relative priority but may not guarantee latency improvements.
- ✗
Move the VM to another datastore
Why it's wrong here
This may spread load but does not directly address the root cause of latency on the current datastore.
- ✗
Set a higher I/O limit on the VM
Why it's wrong here
Setting a limit caps I/O but may not reduce latency; it could even worsen performance.
- ✓
Enable Storage I/O Control (SIOC) on the datastore
Why this is correct
SIOC uses latency thresholds to throttle I/O and reduce congestion, improving latency for critical VMs.
Go deeper
Related to this question
About these practice questions
This VCP-DCV question is part of Courseiva's 498-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
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.