LFCS Storage Management Practice Question
An administrator has created an LVM thin pool. Which command should be used to create a thin logical volume named 'thinvol' of size 100GB from the thin pool 'pool1' in volume group 'vg1'?
⚠ Common exam trap
It's easy for candidates to confuse the `-L` flag (used for standard LVs or pool sizes) with the `-V` flag (required for thin volumes), leading them to select option D, which incorrectly uses `-L` instead of `-V` for the thin volume's virtual size.
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
✓
lvcreate -V 100G -T vg1/pool1 --name thinvol
The `lvcreate` command for thin logical volumes requires the `-V` flag to specify the virtual size of the thin volume and the `-T` flag to reference the thin pool. The syntax `-V 100G -T vg1/pool1 --name thinvol` correctly creates a thin logical volume named 'thinvol' with a virtual size of 100GB from the thin pool 'pool1' in volume group 'vg1'.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
lvcreate -L 100G -n thinvol vg1
Why it's wrong here
Omitting -T makes lvcreate create a normal thick logical volume directly in vg1, not a thin volume from pool1. It is tempting because -L and -n are the standard flags for ordinary LVs, but thin provisioning requires -T to reference the existing thin pool.
- ✗
lvcreate -s vg1/pool1 -n thinvol
Why it's wrong here
The `-s` flag creates a snapshot, and `vg1/pool1` names the thin pool as origin, so this produces a snapshot volume rather than a new 100GB thin volume. It is tempting because `-s` is used with thin pools, and it would be correct when cloning an existing thin volume instead of provisioning fresh space.
- ✓
lvcreate -V 100G -T vg1/pool1 --name thinvol
Why this is correct
The -V flag creates a virtual (thin) volume, while -T names the thin pool vg1/pool1 as its backing store. This pairing is what distinguishes thin provisioning from a standard linear LV, satisfying the 100GB thinvol requirement.
- ✗
lvcreate -L 100G -T vg1/pool1 --name thinvol
Why it's wrong here
This command is actually correct syntax for creating a thin volume, so it does not belong among the incorrect options. It is tempting to reject because -T looks like it targets the pool rather than the new volume, but -T names the thin pool and --name sets the new LV.
Go deeper
Related to this question
About these practice questions
This LFCS question is part of Courseiva's 406-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
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.