CV0-004 Troubleshooting Practice Question
Exhibit
Refer to the exhibit. Filesystem Size Used Avail Use% Mounted on /dev/xvda1 20G 19G 1.0G 95% / tmpfs 1.9G 0 1.9G 0% /dev/shm Application error: 'No space left on device' when writing to /var/log/app.log.
The exhibit shows the output of the df command and an application error. What is the most likely cause of the error?
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
✓
The /var partition is full.
The df output shows the /var partition is at 100% utilization, and the application error indicates it cannot write to disk, likely due to the /var partition being full. Option A is incorrect because /dev/shm is a tmpfs and not relevant to application writing to /var/log. Option C is incorrect because there is no evidence of filesystem corruption. Option D is incorrect because the root filesystem still has space; the error indicates a space issue, not inode exhaustion.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The /dev/shm partition is full.
Why it's wrong here
The /dev/shm partition is shown as 0% used.
- ✓
The /var partition is full.
Why this is correct
The root partition is at 95% usage, and since /var is under /, it is likely full.
- ✗
The filesystem is corrupt.
Why it's wrong here
Filesystem corruption would typically show different symptoms.
- ✗
The inode usage on the root filesystem is exhausted.
Why it's wrong here
While possible, df output shows space usage, and the more likely cause based on the data is space exhaustion.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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