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 RHEL 8 system has an ext4 filesystem on /dev/sdb1 mounted at /backup. The admin runs out of space and wants to extend the filesystem. He adds a new disk /dev/sdc, creates a partition /dev/sdc1 (all space), adds it to LVM by creating a PV and extending the VG that contains the LV for /backup. He then extends the logical volume with lvextend -L+20G /dev/vg_backup/lv_backup. The command succeeds, but the filesystem still shows the old size. What did he forget to do?
Reboot the system to recognize the new space.
Why wrong: No reboot needed; an online resize is sufficient.
Resize the filesystem using resize2fs.
The LV is larger, but the filesystem must be resized to use the space.
Run lvchange -ay to activate the logical volume.
Why wrong: The LV is already active.
Unmount the filesystem before extending the LV.
Why wrong: LVM supports online extension; unmounting is not required.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Resize the filesystem using resize2fs.
When extending an LVM logical volume, the `lvextend` command only expands the logical volume's block device, not the filesystem residing on it. After extending the LV, the admin must run `resize2fs` (for ext4) to resize the filesystem to match the new LV size. Without this step, the kernel still sees the old filesystem metadata, so `df -h` reports the original size.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Reboot the system to recognize the new space.
Why it's wrong here
No reboot needed; an online resize is sufficient.
Resize the filesystem using resize2fs.
Why this is correct
The LV is larger, but the filesystem must be resized to use the space.
Related concept
Read the scenario before looking for a memorised answer.
Run lvchange -ay to activate the logical volume.
Why it's wrong here
The LV is already active.
Unmount the filesystem before extending the LV.
Why it's wrong here
LVM supports online extension; unmounting is not required.
Common exam traps
The trap here is that candidates assume `lvextend` automatically resizes the filesystem, but it only extends the logical volume; a separate filesystem resize command is required for non-LVM-aware filesystems like ext4.
Detailed technical explanation
Under the hood, `lvextend` updates the LVM metadata and the kernel device-mapper mapping, but the ext4 superblock still records the old block count. `resize2fs` reads the new device size from the block device, recalculates the number of blocks, and updates the superblock and group descriptors accordingly. In real-world scenarios, forgetting this step is common when automating LVM extensions, and using `lvextend -r` (the `-r` flag) can automatically resize the filesystem, avoiding the oversight.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Configure local storage — This question tests Configure local storage — Read the scenario before looking for a memorised answer..
The correct answer is: Resize the filesystem using resize2fs. — When extending an LVM logical volume, the `lvextend` command only expands the logical volume's block device, not the filesystem residing on it. After extending the LV, the admin must run `resize2fs` (for ext4) to resize the filesystem to match the new LV size. Without this step, the kernel still sees the old filesystem metadata, so `df -h` reports the original size.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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