CV0-004 Troubleshooting Practice Question
A virtual machine in a cloud environment is experiencing high disk I/O latency. The administrator checks the performance metrics and sees that the disk queue length is consistently above 100. What is the best immediate 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
✓
Attach an additional disk and stripe the data
Attach an additional disk and stripe the data. A high disk queue length indicates that the disk is overwhelmed with I/O requests. Stripping data across multiple disks (e.g., RAID 0) distributes the I/O load, reducing queue length and latency. Option B is wrong because network bandwidth does not affect disk I/O. Option C is wrong because migrating to a host with faster disks may help but is not the immediate action; adding disks is quicker and more direct. Option D is wrong because increasing memory does not directly improve disk I/O performance.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Attach an additional disk and stripe the data
Why this is correct
Stripping adds parallelism, reducing queue depth and improving latency.
- ✗
Upgrade the VM's network bandwidth
Why it's wrong here
Network bandwidth does not affect local disk I/O.
- ✗
Migrate the VM to a host with faster disks
Why it's wrong here
Migration may help but is not immediate; attaching disks is faster.
- ✗
Increase the VM's memory
Why it's wrong here
Memory increase does not improve disk I/O performance.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
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JA
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.