LFCS Storage Management Practice Question
Exhibit
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 100G 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 50G 0 part / └─sda3 8:3 0 49G 0 part └─vg_data-lv_data (dm-0) 252:0 0 98G 0 lvm /data sdb 8:16 0 20G 0 disk └─sdb1 8:17 0 20G 0 part └─vg_data-lv_backup (dm-1) 252:1 0 15G 0 lvm /backup sdc 8:32 0 10G 0 disk
Refer to the exhibit. The administrator wants to extend the /data filesystem by an additional 10GB. The volume group vg_data has only 1GB of free physical extents. Which action should be taken first?
⚠ Common exam trap
Linux Foundation often tests the misconception that you can extend a logical volume without first ensuring the volume group has enough free physical extents, leading candidates to choose options that attempt to manipulate existing volumes (like shrinking or deleting) instead of adding new storage capacity.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add /dev/sdc as a physical volume and extend vg_data.
The /data filesystem needs an additional 10GB, but vg_data has only 1GB of free physical extents. To extend the logical volume, the volume group must have sufficient free physical extents. Adding /dev/sdc as a physical volume and extending vg_data increases the pool of physical extents, making the required space available. This is the correct first step because you cannot extend a logical volume beyond the available free extents in its volume group.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Delete the /backup logical volume to free space.
Why it's wrong here
Destructive and unnecessary.
- ✓
Add /dev/sdc as a physical volume and extend vg_data.
Why this is correct
Correct first step.
- ✗
Reduce the size of /backup to free space in vg_data.
Why it's wrong here
Could work but not first choice; may not free enough.
- ✗
Create a new logical volume from the free space in vg_data.
Why it's wrong here
Free space insufficient.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.