The correct step is to add the noatime mount option in /etc/fstab. This works because noatime disables the updating of file access timestamps on every read operation, eliminating a major source of metadata writes that clog disk I/O. When a system experiences slow disk I/O, reducing unnecessary write operations frees up bandwidth for actual data transfers, directly improving throughput. On the CompTIA Linux+ XK0-005 exam, this question tests your understanding of filesystem mount options and their performance impact—a common trap is confusing noatime with relatime, which still updates atime under certain conditions. Remember that noatime is the most aggressive option for read-heavy workloads where access timestamps are not required. A simple memory tip: “No atime, no crime against I/O.”
XK0-005 Troubleshooting Practice Question
This XK0-005 practice question tests your understanding of troubleshooting. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
[ 2.345678] EXT4-fs (sda1): mounted filesystem with ordered data mode. Options: (null)
[ 2.345690] systemd[1]: Started Journal Service.
[ 2.345700] sd 0:0:0:0: [sda] No Caching mode page found
[ 2.345710] sd 0:0:0:0: [sda] Assuming drive cache: write through
The system is experiencing slow disk I/O. Based on the exhibit, which step should the administrator take to improve performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add the 'noatime' mount option in /etc/fstab
The 'noatime' mount option disables updating the access time (atime) on every file read, which eliminates a significant source of metadata write operations. Since the exhibit indicates slow disk I/O, reducing unnecessary writes directly improves performance by freeing I/O bandwidth for actual data transfers. This is a standard, low-risk optimization for workloads where access timestamps are not required.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Increase the filesystem block size
Why it's wrong here
Requires reformatting, not a quick fix.
✗
Enable write-back caching on the drive using hdparm
Why it's wrong here
Drive does not support caching mode page; may not help.
✓
Add the 'noatime' mount option in /etc/fstab
Why this is correct
Correct: Reduces disk writes by not updating access times.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the I/O scheduler to 'deadline'
Why it's wrong here
May help but does not address the caching mode issue.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often focus on I/O schedulers or caching mechanisms to fix slow I/O, overlooking the simple and effective filesystem mount option that reduces unnecessary write operations.
Detailed technical explanation
How to think about this question
Under the hood, each file read by default triggers an atime update, which is a synchronous metadata write that can cause journal commits and cache flushes. The 'noatime' option eliminates these writes, and 'relatime' (default in modern kernels) only updates atime if the previous atime is older than the mtime or ctime, but 'noatime' goes further by disabling all atime updates. In real-world scenarios like web servers or virtual machine hosts, this can reduce write I/O by 10-30% on busy filesystems.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add the 'noatime' mount option in /etc/fstab — The 'noatime' mount option disables updating the access time (atime) on every file read, which eliminates a significant source of metadata write operations. Since the exhibit indicates slow disk I/O, reducing unnecessary writes directly improves performance by freeing I/O bandwidth for actual data transfers. This is a standard, low-risk optimization for workloads where access timestamps are not required.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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