The answer is memory overcommitment ratio, available memory per host, and storage IOPS capacity for boot storms. These three factors are critical because VDI sizing hinges on balancing user density against performance risk: memory overcommitment allows more virtual desktops per host but must be carefully calculated against the host’s physical RAM, while storage IOPS capacity must handle the massive read burst when 1000 desktops boot simultaneously—a boot storm that can overwhelm traditional arrays and cause timeouts. On the VCP-DCV exam, this tests your understanding of resource contention in Horizon environments; a common trap is focusing solely on CPU or network bandwidth while ignoring that boot storms are the primary storage bottleneck. A useful memory tip is “RAM for density, IOPS for storms”—always verify that your flash or caching layer can absorb the peak load before finalizing cluster sizing.
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.
Which THREE factors should be considered when sizing a host cluster for a VDI environment with 1000 desktops? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Storage IOPS capacity for boot storms.
Storage IOPS capacity for boot storms is critical because when 1000 desktops boot simultaneously (e.g., at start of shift), they generate a massive burst of read I/O. If the storage array cannot handle the peak IOPS, desktops will experience slow boot times or timeouts. Proper sizing must account for both steady-state IOPS and the boot storm peak, often using flash storage or caching to absorb the load.
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.
✗
vMotion compatibility between hosts.
Why it's wrong here
Incorrect: Important for maintenance but not a sizing factor.
✗
NUMA alignment of virtual desktops.
Why it's wrong here
Incorrect: Typically desktops have few vCPUs, so NUMA is less critical.
✓
Storage IOPS capacity for boot storms.
Why this is correct
Correct: Boot storms can saturate storage; IOPS must be sufficient.
Related concept
Read the scenario before looking for a memorised answer.
✓
vCPU-to-core ratio to prevent CPU contention.
Why this is correct
Correct: Overcommitment leads to poor performance.
Related concept
Read the scenario before looking for a memorised answer.
✓
Memory overcommitment ratio and available memory per host.
Why this is correct
Correct: Memory is often the limiting factor in VDI.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse operational features (like vMotion compatibility) with true capacity-sizing factors, or they mistakenly think NUMA alignment is a sizing input rather than a post-deployment optimization.
Detailed technical explanation
How to think about this question
Boot storms occur when many VMs power on simultaneously, causing a spike in read IOPS that can overwhelm traditional spinning disks. In vSphere, storage I/O control and SIOC (Storage I/O Control) can help manage contention, but the underlying array must be sized for the peak load. For 1000 desktops, a typical boot storm might require 10,000–20,000 IOPS for several minutes, which demands either all-flash arrays or hybrid arrays with sufficient cache.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: Storage IOPS capacity for boot storms. — Storage IOPS capacity for boot storms is critical because when 1000 desktops boot simultaneously (e.g., at start of shift), they generate a massive burst of read I/O. If the storage array cannot handle the peak IOPS, desktops will experience slow boot times or timeouts. Proper sizing must account for both steady-state IOPS and the boot storm peak, often using flash storage or caching to absorb the load.
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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