XK0-006 Troubleshooting Practice Question
A system is experiencing high disk I/O wait. Which command can provide disk I/O statistics such as requests per second and average wait time?
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 reports disk I/O statistics including r/s, w/s, await, %util. vmstat shows memory and CPU stats, free shows memory, sar can show I/O but iostat is I/O-specific.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
sar -u 1 5
Why it's wrong here
sar -u reports CPU usage, not disk I/O.
- ✓
iostat -x 1
Why this is correct
iostat -x gives extended stats like r/s, w/s, await, %util.
- ✗
free -h
Why it's wrong here
free shows memory usage, not disk I/O.
- ✗
vmstat 1 5
Why it's wrong here
vmstat shows memory, CPU, and swap, not detailed disk I/O.
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