This LFCS practice question tests your understanding of storage management. 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.
An administrator has added a new disk (/dev/sdb) to a Linux system. The disk is to be used as a physical volume in an existing volume group 'vg_data'. Which sequence of commands should be executed to make the disk available to the volume group?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
pvcreate /dev/sdb; vgextend vg_data /dev/sdb
Option B is correct because it first initializes the disk as a physical volume using `pvcreate`, which writes LVM metadata to /dev/sdb, and then extends the existing volume group 'vg_data' with `vgextend`, adding the new PV to the VG. This is the standard two-step process for adding a new disk to an existing LVM volume group.
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.
fdisk is unnecessary unless partitioning is required; raw disk can be used as PV.
✓
pvcreate /dev/sdb; vgextend vg_data /dev/sdb
Why this is correct
Correct sequence: pvcreate then vgextend.
Related concept
Read the scenario before looking for a memorised answer.
✗
pvcreate /dev/sdb; vgcreate vg_data /dev/sdb
Why it's wrong here
vgcreate creates a new volume group, but the intention is to extend an existing VG.
✗
vgcreate /dev/sdb; vgextend vg_data /dev/sdb
Why it's wrong here
vgcreate creates a new volume group, not extends an existing one.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think partitioning (fdisk) is required before LVM operations, or confuse `vgcreate` (which creates a new VG) with `vgextend` (which adds to an existing VG), leading them to pick options that either perform unnecessary steps or use the wrong command for the task.
Detailed technical explanation
How to think about this question
Under the hood, `pvcreate` writes LVM metadata (including a UUID and PV label) to the first few sectors of the disk (typically sector 1 on GPT or the second sector on MBR), which allows LVM to recognize it as a physical volume. The `vgextend` command then updates the VG metadata on all PVs in the volume group to include the new PV, rebalancing extents if needed. A real-world scenario: if the disk already contains a filesystem or partition table, `pvcreate` with the `-f` flag can force overwrite, but without it, the command will fail to prevent accidental data loss.
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 LFCS 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.
Storage Management — This question tests Storage Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: pvcreate /dev/sdb; vgextend vg_data /dev/sdb — Option B is correct because it first initializes the disk as a physical volume using `pvcreate`, which writes LVM metadata to /dev/sdb, and then extends the existing volume group 'vg_data' with `vgextend`, adding the new PV to the VG. This is the standard two-step process for adding a new disk to an existing LVM volume group.
What should I do if I get this LFCS 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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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.
Question Discussion
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