This EX200 practice question tests your understanding of configure local storage. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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
# df -h /data
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-lv_data
5.0G 3.9G 1.1G 79% /data
# lvextend -L +2G /dev/vg00/lv_data
Size of logical volume vg00/lv_data changed from 5.00 GiB to 7.00 GiB.
Logical volume vg00/lv_data successfully resized.
# df -h /data
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-lv_data
5.0G 3.9G 1.1G 79% /data
# cat /etc/fstab | grep data
/dev/mapper/vg00-lv_data /data xfs defaults 0 0
Refer to the exhibit. After extending the logical volume, why does the df output still show 5.0G?
Exhibit
# df -h /data
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-lv_data
5.0G 3.9G 1.1G 79% /data
# lvextend -L +2G /dev/vg00/lv_data
Size of logical volume vg00/lv_data changed from 5.00 GiB to 7.00 GiB.
Logical volume vg00/lv_data successfully resized.
# df -h /data
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-lv_data
5.0G 3.9G 1.1G 79% /data
# cat /etc/fstab | grep data
/dev/mapper/vg00-lv_data /data xfs defaults 0 0
A
The lvextend command failed silently.
Why wrong: The output shows success, so it did not fail.
B
The filesystem type is ext4 and requires resize2fs.
Why wrong: The exhibit shows XFS, not ext4.
C
The mount point /data is not accessible.
Why wrong: df shows the mount point, so it is accessible.
D
The filesystem needs to be resized with xfs_growfs.
For XFS, after lvextend, you must run xfs_growfs to resize the filesystem to use the new space.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The filesystem needs to be resized with xfs_growfs.
The correct answer is D because the output shows the logical volume was extended (e.g., from 5G to 10G), but the filesystem itself has not been resized to use the new space. For XFS filesystems, the `xfs_growfs` command must be run to expand the filesystem to match the logical volume size. The `df` command reports filesystem usage, not block device size, so it still shows 5.0G until the filesystem is grown.
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.
✗
The lvextend command failed silently.
Why it's wrong here
The output shows success, so it did not fail.
✗
The filesystem type is ext4 and requires resize2fs.
Why it's wrong here
The exhibit shows XFS, not ext4.
✗
The mount point /data is not accessible.
Why it's wrong here
df shows the mount point, so it is accessible.
✓
The filesystem needs to be resized with xfs_growfs.
Why this is correct
For XFS, after lvextend, you must run xfs_growfs to resize the filesystem to use the new space.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume extending the logical volume automatically resizes the filesystem, but XFS requires a separate `xfs_growfs` step, unlike ext4 which can be resized with `resize2fs` after lvextend.
Trap categories for this question
Command / output trap
The output shows success, so it did not fail.
Detailed technical explanation
How to think about this question
When an XFS filesystem is created on a logical volume, it records the original size in its superblock. The `lvextend` command only expands the underlying block device; the filesystem must be explicitly grown with `xfs_growfs /mountpoint` (or `xfs_growfs /dev/mapper/vg-lv`). Unlike ext4, XFS does not support online shrinking, and `xfs_growfs` can only be run on a mounted filesystem. This is a common scenario when extending virtual disks in cloud environments or SAN storage.
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: The filesystem needs to be resized with xfs_growfs. — The correct answer is D because the output shows the logical volume was extended (e.g., from 5G to 10G), but the filesystem itself has not been resized to use the new space. For XFS filesystems, the `xfs_growfs` command must be run to expand the filesystem to match the logical volume size. The `df` command reports filesystem usage, not block device size, so it still shows 5.0G until the filesystem is grown.
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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