VCP-VVF Troubleshoot And Optimize Practice Question
An administrator is troubleshooting a virtual machine performance issue in a vSphere 9.0 cluster. The VM has 8 vCPUs, but the guest OS workload is single-threaded and running slowly. Upon checking esxtop, the administrator notices high co-stop (%CSTP) time. What is the recommended optimization action?
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
✓
Reduce the number of vCPUs assigned to the virtual machine to match its actual workload concurrency requirements.
Assigning too many vCPUs (oversizing) to a single-threaded workload forces the ESXi scheduler to wait for all vCPUs to be ready simultaneously before scheduling them (%CSTP), hurting performance. Right-sizing the VM by reducing the vCPU count resolves this.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch the vDS uplink teaming policy from Route Based on Originating Port to IP Hash.
Why it's wrong here
Uplink teaming policies manage network load balancing, not CPU scheduling.
- ✗
Enable Storage I/O Control on the datastore.
Why it's wrong here
SIOC manages storage latency, not CPU co-stop.
- ✓
Reduce the number of vCPUs assigned to the virtual machine to match its actual workload concurrency requirements.
Why this is correct
Right-sizing vCPUs eliminates unnecessary co-scheduling overhead and reduces co-stop time.
- ✗
Increase the virtual machine memory reservation to 100%.
Why it's wrong here
Memory reservations do not fix CPU co-stop issues caused by vCPU oversizing.
Visual reference
About these practice questions
One of 517 original VCP-VVF practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official VMware exam blueprint
This VCP-VVF 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-VVF exam.