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Exam XK0-006 Topic 1 Question 15 Discussion

Actual exam question for CompTIA's XK0-006 exam
Question #: 15
Topic #: 1
A Linux server is experiencing slowness. A systems administrator obtains the following output:
top - load average: 2.43, 1.80, 2.32
Tasks: ... 154 zombie
%Cpu(s): 6.2 us, 5.1 sy, 0.0 ni, 79.2 id, 9.1 wa, ...
$ iostat -m 2
%user %nice %system %iowait %steal %idle
4.30 2.02 0.29 70.38 4.00 19.01
Which of the following explains the issue?

Suggested Answer: C Vote an answer

Performance troubleshooting in CompTIA Linux+ V8 requires the ability to correlate metrics from tools like top, vmstat, and iostat. In this case, the iostat output provides the most critical data point: %iowait is at 70.38%.
The %iowait metric (also shown as wa in top) represents the percentage of time that the CPU was idle while there were outstanding disk I/O requests. Essentially, the CPU is waiting for the storage subsystem (hard drives or SSDs) to complete read or write operations. A value as high as 70% indicates a severe bottleneck in the storage layer. This "I/O wait" causes the system to feel sluggish or unresponsive because processes are stuck in an uninterruptible sleep state while waiting for data from the disk.

by Hilary at Jul 24, 2026, 03:42 AM

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