EX200 Deploy, configure, and maintain systems Practice Question
This EX200 practice question tests your understanding of deploy, configure, and maintain systems. 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 system has a new disk /dev/sdb that needs to be used as an LVM physical volume for an existing volume group 'vg_data'. Which sequence of commands is correct?
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 D is correct because the disk /dev/sdb must first be initialized as a physical volume using pvcreate, then added to the existing volume group vg_data using vgextend. This sequence properly extends the volume group with the new physical volume, as required by LVM.
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.
✗
vgcreate vg_data /dev/sdb; pvcreate /dev/sdb
Why it's wrong here
vgcreate creates a new VG, but /dev/sdb is not yet a PV; pvcreate must come first.
✗
lvextend vg_data /dev/sdb
Why it's wrong here
lvextend extends a logical volume, not a volume group.
✗
pvcreate /dev/sdb; vgcreate vg_data /dev/sdb
Why it's wrong here
vgcreate creates a new VG, but the VG already exists; use vgextend instead.
✓
pvcreate /dev/sdb; vgextend vg_data /dev/sdb
Why this is correct
First create the PV, then extend the existing VG.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse vgcreate (which creates a new volume group) with vgextend (which adds a physical volume to an existing volume group), leading them to select option C instead of D.
Detailed technical explanation
How to think about this question
LVM requires physical volumes to be initialized with pvcreate, which writes LVM metadata (including a UUID) to the disk. The vgextend command then adds this physical volume to an existing volume group, updating the volume group descriptor area (VGDA) to include the new physical extent(s). In real-world scenarios, this allows administrators to dynamically increase storage capacity without downtime, as the volume group can then allocate new logical volumes or extend existing ones.
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.
Deploy, configure, and maintain systems — This question tests Deploy, configure, and maintain systems — 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 D is correct because the disk /dev/sdb must first be initialized as a physical volume using pvcreate, then added to the existing volume group vg_data using vgextend. This sequence properly extends the volume group with the new physical volume, as required by LVM.
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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Question Discussion
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