EX200 Create and configure file systems Practice Question
This EX200 practice question tests your understanding of create and configure file systems. 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.
$ df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vg_root-lv_root xfs 20G 18G 2G 90% /
/dev/sda1 xfs 1014M 173M 842M 17% /boot
The root filesystem is at 90% capacity. Which command increases available space without unmounting?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Option B is correct because it first extends the logical volume with `lvextend -L +5G`, then grows the XFS filesystem online with `xfs_growfs /` to utilize the new space without unmounting. This is the proper procedure for XFS filesystems, which require `xfs_growfs` (not `resize2fs`) to expand while mounted.
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.
✗
fstrim /
Why it's wrong here
Incorrect: fstrim discards unused blocks but does not increase filesystem size.
Correct: Extends the LV and grows the XFS filesystem.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
resize2fs /dev/mapper/vg_root-lv_root
Why it's wrong here
Incorrect: resize2fs is for ext filesystems, not XFS.
✗
lvextend -L +5G /dev/mapper/vg_root-lv_root
Why it's wrong here
Incorrect: This only extends the LV; the filesystem must be grown separately.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the distinction between filesystem-specific resizing tools (xfs_growfs vs. resize2fs) and the need to run both the LVM extension and the filesystem grow command; the trap here is that candidates may think `lvextend` alone is sufficient or that `resize2fs` works on all filesystems.
Detailed technical explanation
How to think about this question
XFS filesystems require the `xfs_growfs` command to expand online, which operates on the mount point (e.g., `/`) rather than the device. The `lvextend` command extends the underlying LVM logical volume, but the filesystem must be explicitly told to use the new space; `xfs_growfs` can be run repeatedly and is idempotent. In contrast, ext4 uses `resize2fs` which can also grow online but is incompatible with XFS.
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 practitioner preparing for the EX200 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Create and configure file systems — This question tests Create and configure file systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: lvextend -L +5G /dev/mapper/vg_root-lv_root && xfs_growfs / — Option B is correct because it first extends the logical volume with `lvextend -L +5G`, then grows the XFS filesystem online with `xfs_growfs /` to utilize the new space without unmounting. This is the proper procedure for XFS filesystems, which require `xfs_growfs` (not `resize2fs`) to expand while mounted.
What should I do if I get this EX200 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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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