- A
Configure Storage I/O Control and set the database VM's shares to High.
Correct: SIOC with high shares gives the database VM priority during congestion.
- B
Set storage I/O limits on all other VMs to 100 IOPS.
Why wrong: Incorrect: Limiting all other VMs is not a best practice and could cause issues; shares are preferred.
- C
Configure Storage I/O Control and set a latency threshold of 5 ms.
Why wrong: Incorrect: Latency threshold is used to trigger SIOC, not to prioritize a specific VM.
- D
Use Storage DRS to migrate idle VMs to another datastore.
Why wrong: Incorrect: Storage DRS moves VMs for load balancing, but does not provide I/O prioritization within a datastore.
Question 251 of 521
VCP-DCV Storage I/O Control (SIOC) Practice Question
This VCP-DCV practice question tests your understanding of configure and manage vsphere storage. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: storage I/O Control (SIOC). Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company experiences high latency on a VM running a critical database. The storage is a VMFS datastore on a SAN. The administrator notices that other VMs on the same datastore are idle. What should the administrator configure to ensure the database VM gets sufficient storage I/O resources?
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
✓
Configure Storage I/O Control and set the database VM's shares to High.
Storage I/O Control (SIOC) dynamically shares storage I/O resources among VMs on a datastore. By setting a higher share value for the database VM, it gets priority during congestion. Option B is incorrect because manually setting low I/O limits on all other VMs is inefficient and may lead to underutilization; SIOC with shares is adaptive. Option C is incorrect because setting a latency threshold (e.g., 5 ms) is a configuration for SIOC to start congestion control, but it does not by itself ensure the database VM gets sufficient I/O; the key is adjusting shares. Option D is incorrect because Storage DRS (not compute DRS) migrates VMs for space and I/O load balancing, but it does not prioritize I/O for a specific VM; it balances across datastores over time.
Key principle: Storage I/O Control (SIOC)
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure Storage I/O Control and set the database VM's shares to High.
Why this is correct
Correct: SIOC with high shares gives the database VM priority during congestion.
Related concept
Storage I/O Control (SIOC)
- ✗
Set storage I/O limits on all other VMs to 100 IOPS.
Why it's wrong here
Incorrect: Limiting all other VMs is not a best practice and could cause issues; shares are preferred.
- ✗
Configure Storage I/O Control and set a latency threshold of 5 ms.
Why it's wrong here
Incorrect: Latency threshold is used to trigger SIOC, not to prioritize a specific VM.
- ✗
Use Storage DRS to migrate idle VMs to another datastore.
Why it's wrong here
Incorrect: Storage DRS moves VMs for load balancing, but does not provide I/O prioritization within a datastore.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Storage I/O Control (SIOC)
- Shares
- Latency Threshold
- Storage DRS
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Storage I/O Control (SIOC)
Real-world example
How this comes up in practice
A practitioner preparing for the VCP-DCV exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Storage I/O Control (SIOC) Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Review storage I/O Control (SIOC), then practise related VCP-DCV questions on the same topic to reinforce the concept.
- →
Configure and Manage vSphere Storage — study guide chapter
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FAQ
Questions learners often ask
What does this VCP-DCV question test?
Configure and Manage vSphere Storage — This question tests Configure and Manage vSphere Storage — Storage I/O Control (SIOC).
What is the correct answer to this question?
The correct answer is: Configure Storage I/O Control and set the database VM's shares to High. — Storage I/O Control (SIOC) dynamically shares storage I/O resources among VMs on a datastore. By setting a higher share value for the database VM, it gets priority during congestion. Option B is incorrect because manually setting low I/O limits on all other VMs is inefficient and may lead to underutilization; SIOC with shares is adaptive. Option C is incorrect because setting a latency threshold (e.g., 5 ms) is a configuration for SIOC to start congestion control, but it does not by itself ensure the database VM gets sufficient I/O; the key is adjusting shares. Option D is incorrect because Storage DRS (not compute DRS) migrates VMs for space and I/O load balancing, but it does not prioritize I/O for a specific VM; it balances across datastores over time.
What should I do if I get this VCP-DCV question wrong?
Review storage I/O Control (SIOC), then practise related VCP-DCV questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Storage I/O Control (SIOC)
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Last reviewed: Jun 24, 2026
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