This EX200 practice question tests your understanding of configure local storage. 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.
A storage administrator is asked to increase the size of an ext4 filesystem mounted at /data. The underlying logical volume /dev/mapper/vg01-lv01 is currently 10GB and the volume group has 5GB of free extents. After extending the logical volume by 2GB using lvextend -L +2G /dev/mapper/vg01-lv01, what command must be run to resize the filesystem?
resize2fs is the correct tool to resize an ext4 filesystem to match the enlarged logical volume.
B
lvextend -r -L +2G /dev/mapper/vg01-lv01
Why wrong: lvextend -r resizes the filesystem automatically, but it should be run before the manual resize step; however, the question says after extending without -r, so we need a separate command. Actually D would have worked if used initially, but now we need resize2fs. So D is not correct as a follow-up.
C
xfs_growfs /data
Why wrong: xfs_growfs is for XFS filesystems, not ext4.
D
fsck -f /dev/mapper/vg01-lv01
Why wrong: fsck checks and repairs filesystem consistency but does not resize it.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
resize2fs /dev/mapper/vg01-lv01
After extending the logical volume with `lvextend`, the filesystem does not automatically recognize the new space. For ext4 filesystems, the `resize2fs` command must be run to resize the filesystem to use the additional logical volume capacity. This command can be executed online (while the filesystem is mounted) and will expand the filesystem to fill the available space in the logical volume.
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.
✓
resize2fs /dev/mapper/vg01-lv01
Why this is correct
resize2fs is the correct tool to resize an ext4 filesystem to match the enlarged logical volume.
Related concept
Read the scenario before looking for a memorised answer.
✗
lvextend -r -L +2G /dev/mapper/vg01-lv01
Why it's wrong here
lvextend -r resizes the filesystem automatically, but it should be run before the manual resize step; however, the question says after extending without -r, so we need a separate command. Actually D would have worked if used initially, but now we need resize2fs. So D is not correct as a follow-up.
✗
xfs_growfs /data
Why it's wrong here
xfs_growfs is for XFS filesystems, not ext4.
✗
fsck -f /dev/mapper/vg01-lv01
Why it's wrong here
fsck checks and repairs filesystem consistency but does not resize it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse filesystem-specific resize commands (resize2fs for ext4 vs. xfs_growfs for XFS) or assume that `lvextend` automatically resizes the filesystem without the `-r` flag.
Trap categories for this question
Command / output trap
lvextend -r resizes the filesystem automatically, but it should be run before the manual resize step; however, the question says after extending without -r, so we need a separate command. Actually D would have worked if used initially, but now we need resize2fs. So D is not correct as a follow-up.
Detailed technical explanation
How to think about this question
The `resize2fs` command works by adjusting the filesystem's superblock and block group descriptors to reflect the new device size. For ext4, this operation can be performed online (mounted) and is safe for production use, though it is recommended to have a backup. A subtle behavior: if the logical volume is shrunk, `resize2fs` must be run before shrinking the LV, and the filesystem must be unmounted or mounted read-only for shrinking.
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.
Configure local storage — This question tests Configure local storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: resize2fs /dev/mapper/vg01-lv01 — After extending the logical volume with `lvextend`, the filesystem does not automatically recognize the new space. For ext4 filesystems, the `resize2fs` command must be run to resize the filesystem to use the additional logical volume capacity. This command can be executed online (while the filesystem is mounted) and will expand the filesystem to fill the available space in the logical volume.
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.
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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