A file server is experiencing slow response times. The administrator runs `iostat -x 1` and sees that the disk device `sda` has an average wait time (`await`) of 850 ms and a utilization (`%util`) of 95%. The server has 16 GB of RAM, and `free -h` shows 12 GB used for page cache. What is the MOST likely cause of the I/O bottleneck?

The network interface is saturated.

The page cache is consuming too much memory.

The disk is saturated with read/write requests.

The CPU is too slow to process I/O requests.

CompTIALinux+

Domain 5Objective 5

Performance XK0-006 Practice Questions (Page 4)

Part of the Troubleshooting domain, which accounts for 22% of the XK0-006 exam. CompTIA does not publish an official question count, but from its 90-minute exam (~35–60 total, ~8–13 in this domain), expect 2–3 from this objective — we provide 24 practice questions to prepare you well beyond it. (estimate)

24questions here

5free pages

5concepts

22%of the exam

Questions 16–20

16expert · hard · select all that apply
A system administrator is troubleshooting a server that is performing poorly. The administrator suspects a CPU bottleneck, but wants to rule out memory and I/O issues. Which of the following commands would provide useful information for this diagnosis? (Select all that apply.)
Select an answer first
17application · medium
A web application server has been gradually slowing down over several weeks. The administrator checks memory usage and sees that the `java` process's RSS has grown from 2 GB to 6 GB, while the application's workload has not changed. The system has 8 GB of RAM and is now using 7.5 GB. Which tool should the administrator use to confirm a memory leak in the Java process?
Select an answer first
18foundation · easy
Which command is used to report CPU and I/O statistics for devices and partitions, helping to identify I/O bottlenecks?
Select an answer first
19application · medium
A file server is experiencing slow response times. The administrator runs `iostat -x 1` and sees that the disk device `sda` has an average wait time (`await`) of 850 ms and a utilization (`%util`) of 95%. The server has 16 GB of RAM, and `free -h` shows 12 GB used for page cache. What is the MOST likely cause of the I/O bottleneck?
Select an answer first
20foundation · easy
Which command is used to display a real-time, interactive view of system processes, including CPU and memory usage, and can be used to monitor overall system performance?
Select an answer first

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Performance XK0-006 Practice Questions (Page 4)

Questions 16–20

A system administrator is troubleshooting a server that is performing poorly. The administrator suspects a CPU bottleneck, but wants to rule out memory and I/O issues. Which of the following commands would provide useful information for this diagnosis? (Select all that apply.)

Which command is used to report CPU and I/O statistics for devices and partitions, helping to identify I/O bottlenecks?

Which command is used to display a real-time, interactive view of system processes, including CPU and memory usage, and can be used to monitor overall system performance?

Keep studying — Troubleshooting