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.
Exhibit
Refer to the exhibit.
[root@server ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 19G 0 part
├─rhel-root 253:0 0 17G 0 lvm /
└─rhel-swap 253:1 0 2G 0 lvm [SWAP]
sdb 8:16 0 10G 0 disk
└─sdb1 8:17 0 10G 0 part
└─mydata-vg-mydata-lv 253:2 0 10G 0 lvm /data
sdc 8:32 0 10G 0 disk
A system administrator runs the following command: # vgextend mydata-vg /dev/sdc. After successfully extending the volume group, what is the next step to make the additional space available in the logical volume mydata-lv?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
lvextend -l +100%FREE /dev/mydata-vg/mydata-lv
Option B is correct because after extending the volume group with vgextend, you must extend the logical volume to use the new free space. The command lvextend -l +100%FREE /dev/mydata-vg/mydata-lv allocates all remaining free extents in the volume group to the logical volume, making the additional space available for the filesystem.
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.
✗
xfs_growfs /data
Why it's wrong here
This grows the XFS filesystem, but must be done after extending the LV.
✓
lvextend -l +100%FREE /dev/mydata-vg/mydata-lv
Why this is correct
Extends LV to use all free extents.
Related concept
Read the scenario before looking for a memorised answer.
✗
resize2fs /dev/mydata-vg/mydata-lv
Why it's wrong here
resize2fs is for ext2/3/4, not XFS.
✗
lvextend -L +10G /dev/mydata-vg/mydata-lv
Why it's wrong here
Adds exactly 10G, but may not be suitable if there is less or more free space.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the order of operations and try to grow the filesystem directly (option A or C) without first extending the logical volume, or they use a specific size (option D) instead of the '100%FREE' syntax to consume all new space.
Detailed technical explanation
How to think about this question
Under the hood, lvextend -l +100%FREE uses the number of free physical extents (PEs) in the volume group to calculate the extension, ensuring the LV consumes all unallocated space. In a real-world scenario, if the new disk /dev/sdc has 50 GiB and the VG had no other free space, this command adds exactly 50 GiB to the LV; after that, a filesystem-specific grow command (like xfs_growfs for XFS) is required to resize the filesystem to use the new LV space.
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: lvextend -l +100%FREE /dev/mydata-vg/mydata-lv — Option B is correct because after extending the volume group with vgextend, you must extend the logical volume to use the new free space. The command lvextend -l +100%FREE /dev/mydata-vg/mydata-lv allocates all remaining free extents in the volume group to the logical volume, making the additional space available for the filesystem.
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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