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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?
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.
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