CV0-004 Troubleshooting Practice Question
A company runs a critical e-commerce application on a private cloud using OpenStack. The application consists of web servers, application servers, and a MySQL database running on separate VMs. Recently, users have reported intermittent 502 Bad Gateway errors during peak hours. The operations team notices that the web server VMs show high CPU ready times and the application server VMs have increased network latency. Storage performance also shows high await times on the SSD-based Ceph cluster. The team suspects resource contention. Which of the following is the BEST course of action to diagnose and resolve the issue?
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
✓
Review the hypervisor's CPU and memory allocation ratios and adjust overcommitment settings.
High CPU ready times and overall contention indicate overcommitment on the hypervisors. Adjusting overcommitment ratios can reduce contention across CPU, memory, and storage. Option A is incorrect because migrating VMs to a different host is a temporary workaround that does not address the root cause of overcommitment. Option B is incorrect because adding more vCPUs can worsen contention by increasing scheduling overhead. Option C is incorrect because QoS policies on storage only address storage contention and do not resolve CPU or network issues.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Migrate the web server VMs to a different compute host using live migration.
Why it's wrong here
Migrating web server VMs to a different compute host may temporarily relieve contention but does not address the underlying overcommitment. It could shift the problem to another host.
- ✗
Increase the number of vCPUs for each web server VM to reduce CPU ready time.
Why it's wrong here
Increasing vCPUs for web server VMs can worsen CPU ready times because more vCPUs increase the scheduling burden on the hypervisor, potentially increasing contention.
- ✗
Implement quality of service (QoS) policies on the Ceph cluster to guarantee IOPS for the database.
Why it's wrong here
Implementing QoS on the Ceph cluster guarantees IOPS for the database, which helps storage performance but does not resolve CPU or network contention.
- ✓
Review the hypervisor's CPU and memory allocation ratios and adjust overcommitment settings.
Why this is correct
Reviewing and adjusting hypervisor CPU and memory allocation ratios directly addresses the root cause of overcommitment, reducing contention across CPU, memory, and storage.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.