The answer is to ensure Hyper-Threading is enabled on all hosts, reduce the number of VMs per host, and upgrade to faster CPUs. These three actions directly address the root cause of high CPU ready time by increasing the pool of logical processors, lowering the CPU demand per physical core, and improving per-core throughput. On the VMware Certified Professional Data Center Virtualization VCP-DCV exam, this scenario tests your understanding of CPU scheduling and contention metrics, often appearing as a multi-select question where distractors like setting CPU affinity or adding vCPUs are common traps. Remember that adding vCPUs to a VM increases co-scheduling pressure and worsens ready time, while aggressive DRS thresholds cause unnecessary migrations without fixing the underlying resource shortage. A useful memory tip is “Less VMs, faster cores, and Hyper-Threading open the door”—focus on reducing demand and increasing capacity, not on forcing placements or adding overhead.
VCP-DCV vSphere Performance and Scaling Practice Question
This VCP-DCV practice question tests your understanding of vsphere performance and scaling. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 vSphere cluster is experiencing high CPU ready time across multiple hosts during peak hours. The cluster consists of 8 hosts, each with 2 sockets and 8 cores per socket (hyperthreading enabled). DRS is set to a moderately aggressive migration threshold. The administrator needs to reduce CPU contention without disrupting workloads. Which three actions should the administrator consider? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Upgrade the ESXi hosts to models with higher CPU clock speeds.
Enabling hyperthreading increases logical CPUs and can reduce ready time. Reducing the number of VMs per host decreases overall demand. Upgrading to faster CPUs increases per-core capacity. Setting CPU affinity on VMs is not recommended as it limits DRS balancing. Increasing the DRS migration threshold to the most aggressive may cause excessive migrations and does not address the root cause. Adding vCPUs to VMs would worsen contention.
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.
✓
Upgrade the ESXi hosts to models with higher CPU clock speeds.
Why this is correct
Faster CPUs improve per-core performance, reducing the impact of contention.
Related concept
Read the scenario before looking for a memorised answer.
✓
Reduce the number of VMs running on each host.
Why this is correct
Fewer VMs per host reduces overall CPU demand and contention.
Related concept
Read the scenario before looking for a memorised answer.
✓
Ensure Hyper-Threading is enabled on all hosts.
Why this is correct
Enabling Hyper-Threading doubles the number of logical CPUs, which can help reduce CPU ready time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure CPU affinity for VMs with high vCPU counts.
Why it's wrong here
CPU affinity is not a best practice and can prevent DRS from balancing effectively.
✗
Increase the DRS migration threshold to the most aggressive setting.
Why it's wrong here
An overly aggressive threshold can cause unnecessary migrations and instability.
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
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 VCP-DCV exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Upgrade the ESXi hosts to models with higher CPU clock speeds. — Enabling hyperthreading increases logical CPUs and can reduce ready time. Reducing the number of VMs per host decreases overall demand. Upgrading to faster CPUs increases per-core capacity. Setting CPU affinity on VMs is not recommended as it limits DRS balancing. Increasing the DRS migration threshold to the most aggressive may cause excessive migrations and does not address the root cause. Adding vCPUs to VMs would worsen contention.
What should I do if I get this VCP-DCV question wrong?
Identify which VCP-DCV exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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. Refer to the exhibit. An administrator runs esxtop and sees the above output for a virtual machine. What is the most likely cause of the performance issue?
medium
A.The VM is running on a host with Hyper-Threading disabled.
B.The memory of the VM is overcommitted.
C.The host has too many other VMs competing for resources.
✓ D.The VM has too many vCPUs for the available physical cores.
E.The VM has CPU affinity configured to a single core.
Why D: Option A is correct because high %RDY (45.2%) and %CSTP (30.1%) indicate that the VM's vCPUs are ready to run but waiting for scheduling, and there is significant co-scheduling overhead. This is typical when a VM has too many vCPUs relative to the physical cores available, causing CPU overcommitment. Options B, C, D, and E could contribute to performance issues, but the specific combination of high %RDY and %CSTP points to vCPU overcommitment.
Variation 2. Which TWO actions are effective in reducing CPU ready time on a vSphere host that is heavily overcommitted on CPU? (Choose two.)
easy
✓ A.Add more hosts to the cluster.
B.Enable hyperthreading on the host CPUs.
C.Increase the number of vCPUs on VMs with high ready times.
✓ D.Reduce the number of vCPUs on over-provisioned VMs.
E.Configure CPU affinity to pin vCPUs to specific pCPUs.
Why A: Reducing the number of vCPUs on over-provisioned VMs directly decreases scheduling contention. Adding more hosts to the cluster increases the pool of physical CPUs, reducing overcommitment. Increasing vCPUs worsens the issue. Enabling hyperthreading does not reduce ready time if the host is already CPU-bound. Configuring CPU affinity restricts scheduling and can increase ready time.
Variation 3. Which TWO actions can be taken to reduce CPU ready time for a virtual machine? (Select TWO.)
medium
A.Enable CPU hot-add and hot-plug for the VM
✓ B.Decrease the number of vCPUs to match the workload
C.Migrate the VM to a host with more physical CPU cores
✓ D.Increase the CPU shares for the VM
E.Add more vCPUs to the VM
Why B: Option B is correct because reducing the number of vCPUs to match the actual workload demand directly decreases the co-scheduling overhead and contention for physical CPU cores. When a VM has more vCPUs than its workload requires, the ESXi scheduler must wait for all assigned vCPUs to become available simultaneously, which inflates CPU ready time. Right-sizing vCPUs to the workload is a best practice to minimize ready time and improve performance.
Variation 4. Which three actions can reduce CPU ready time for a virtual machine in a vSphere cluster? (Choose three.)
medium
A.Enable CPU hot-add on the VM
B.Set the VM's CPU affinity manually
✓ C.Place the VM on a host with lower CPU utilization
✓ D.Reduce the number of vCPUs allocated to the VM
✓ E.Increase the host's physical CPU count by adding a new host to the cluster
Why C: The correct options are B, D, and E. Reducing vCPUs reduces contention, adding hosts increases resources, and placing on less loaded host reduces ready time. Hot-add does not reduce ready time; manual CPU affinity can worsen.
Last reviewed: Jun 24, 2026
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