VCP-DCV Configure and Manage vSphere Storage Practice Question
An administrator is troubleshooting performance issues on a VMFS datastore hosting SQL Server VMs. Storage I/O Control (SIOC) is enabled, but the administrator notices that congestion is detected but no throttling is applied. What could be the reason?
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
✓
The SIOC congestion threshold is set too high
SIOC (Storage I/O Control) throttles I/O from VMs when congestion is detected and the queue depth threshold is exceeded. If the congestion threshold is set too high, throttling may not be triggered even when congestion is detected, because the actual queue depth may not exceed the threshold. Option B (the datastore is deduplicated) is not relevant because deduplication does not affect SIOC throttling. Option C (SIOC is disabled) would mean congestion would not be detected. Option D (host exceeded max concurrent I/Os) is a host-side issue, not directly related to SIOC threshold.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The SIOC congestion threshold is set too high
Why this is correct
The threshold determines when throttling starts; a high value may prevent activation.
- ✗
The datastore is deduplicated
Why it's wrong here
Deduplication does not affect SIOC throttling.
- ✗
SIOC is disabled on the datastore
Why it's wrong here
If disabled, congestion would not be detected.
- ✗
The host has exceeded the maximum number of concurrent I/Os
Why it's wrong here
That would cause throttling if SIOC is enabled.
Go deeper
Related to this question
About these practice questions
Courseiva writes every VCP-DCV question from scratch — 498 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.