XK0-006 Troubleshooting Practice Question
An administrator wants to monitor disk I/O performance in real-time, focusing on metrics like wait time and I/O queue size. Which tool is best suited for this?
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
✓
iostat -x 1
iostat provides detailed disk I/O statistics including await, svctime, %util, and queue size.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
vmstat
Why it's wrong here
vmstat provides system-level I/O wait but not per-disk metrics.
- ✗
sar -b
Why it's wrong here
sar -b shows I/O statistics but not real-time; it's historical.
- ✗
free -h
Why it's wrong here
free shows memory usage, not disk I/O.
- ✓
iostat -x 1
Why this is correct
iostat -x extended statistics every 1 second.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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