VCP-DCV Configure and Manage vSphere Storage Practice Question
An administrator notices that a VM with high I/O demands is experiencing performance issues because other VMs on the same datastore are consuming too many I/O operations. Which feature can be used to guarantee a minimum I/O share to 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
✓
Storage I/O Control shares
Storage I/O Control (SIOC) allows setting shares, limits, and reservations to allocate I/O bandwidth per VM. Storage DRS balances I/O across datastores, not per-VM; multipathing selects paths; VM storage policies manage provisioning.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Multipathing policy
Why it's wrong here
Multipathing policy selects paths for redundant storage, not I/O guarantees.
- ✗
VM storage policy
Why it's wrong here
VM storage policy defines provisioning requirements, not I/O performance guarantees.
- ✗
Storage DRS
Why it's wrong here
Storage DRS balances I/O load across datastores, not per-VM guarantees.
- ✓
Storage I/O Control shares
Why this is correct
SIOC uses shares to allocate relative I/O priority to VMs.
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Same concept, more angles
1 more way this is tested on VCP-DCV
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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?
medium- ✓ A.The SIOC congestion threshold is set too high
- B.The datastore is deduplicated
- C.SIOC is disabled on the datastore
- D.The host has exceeded the maximum number of concurrent I/Os
Why A: 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.
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.