VCP-DCV vSphere Performance and Scaling Practice Question
This VCP-DCV practice question tests your understanding of vsphere performance and scaling. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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's vSphere environment has multiple clusters with varying workloads. The operations team notices that one cluster consistently shows high CPU ready times on several hosts. Which action should be taken to address this performance issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reduce the number of virtual CPUs assigned to VMs and consider adding more hosts.
High CPU ready times indicate that VMs are contending for physical CPU resources because the host is over-provisioned with vCPUs relative to available pCPUs. Reducing the number of vCPUs per VM decreases scheduling overhead and contention, while adding more hosts increases the total pCPU count, directly alleviating the bottleneck. Option C correctly addresses both the demand-side (vCPU reduction) and supply-side (host addition) of the CPU scheduling issue.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 memory allocation of VMs with high CPU ready times.
Why it's wrong here
This does not address CPU contention.
✗
Increase the CPU reservation for VMs with high ready times.
Why it's wrong here
Reservations can increase contention.
✓
Reduce the number of virtual CPUs assigned to VMs and consider adding more hosts.
Why this is correct
Reducing vCPUs and adding hosts reduces CPU contention.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Storage DRS to balance storage I/O load.
Why it's wrong here
Storage DRS does not affect CPU ready times.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CPU ready time with memory pressure or storage latency, leading them to choose memory or storage-related solutions instead of addressing the core CPU over-provisioning issue.
Detailed technical explanation
How to think about this question
CPU ready time is measured as the percentage of time a VM is ready to run but waiting for a physical CPU (pCPU) to become available. In vSphere, the CPU scheduler uses a proportional-share algorithm with co-scheduling for SMP VMs; excessive vCPUs per pCPU (e.g., >4:1 ratio) can cause co-scheduling overhead and inflated ready times. Real-world scenarios often involve VMs with idle vCPUs (e.g., a 4-vCPU VM running a single-threaded app), which still consume scheduling slots and increase contention.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
vSphere Performance and Scaling — This question tests vSphere Performance and Scaling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Reduce the number of virtual CPUs assigned to VMs and consider adding more hosts. — High CPU ready times indicate that VMs are contending for physical CPU resources because the host is over-provisioned with vCPUs relative to available pCPUs. Reducing the number of vCPUs per VM decreases scheduling overhead and contention, while adding more hosts increases the total pCPU count, directly alleviating the bottleneck. Option C correctly addresses both the demand-side (vCPU reduction) and supply-side (host addition) of the CPU scheduling issue.
What should I do if I get this VCP-DCV question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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