LPIC-2 Practice Question: Block Devices, Filesystems and Advanced Storage
This LPIC-2 practice question tests your understanding of block devices, filesystems and advanced 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.
Which TWO statements about LVM thin provisioning are correct?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It allows creating logical volumes that can be larger than the available physical storage.
Option B is correct because LVM thin provisioning allows creating logical volumes that appear larger than the available physical storage (overcommitment). This is achieved by allocating data blocks on demand from a thin pool, rather than reserving them at creation time. The thin pool itself must have sufficient physical storage to accommodate actual writes, but the logical volume size can exceed the pool's capacity.
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.
✗
Thin pools automatically extend when they reach 80% usage.
Why it's wrong here
Auto-extension is not default; must be configured with dmeventd.
✓
It allows creating logical volumes that can be larger than the available physical storage.
Why this is correct
Thin provisioning enables over-commitment.
Related concept
Read the scenario before looking for a memorised answer.
✗
A thin pool cannot be extended once created.
Why it's wrong here
Thin pools can be extended with lvextend.
✗
It is only supported on SSDs.
Why it's wrong here
Thin provisioning works on any block device.
✓
Thin snapshots are space-efficient because they share data blocks.
Why this is correct
Thin snapshots use copy-on-write and share common blocks.
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 confuse thin provisioning with automatic extension or assume thin pools are static, when in fact thin pools can be extended and automatic extension requires explicit configuration.
Detailed technical explanation
How to think about this question
Under the hood, LVM thin provisioning uses a thin pool (a special logical volume) that stores metadata and data chunks. When a thin logical volume is written to, the device-mapper thin-provisioning target allocates a new data block from the pool's data area. This on-demand allocation enables overcommitment, but if the pool runs out of space, writes to thin volumes will fail (the volume goes into 'out-of-data-space' mode) unless monitoring tools extend the pool in time. In real-world scenarios, administrators often set up automatic monitoring with `lvm.conf` or `dmeventd` to extend the pool when usage reaches a defined percentage.
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 LPIC-2 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.
Block Devices, Filesystems and Advanced Storage — This question tests Block Devices, Filesystems and Advanced Storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It allows creating logical volumes that can be larger than the available physical storage. — Option B is correct because LVM thin provisioning allows creating logical volumes that appear larger than the available physical storage (overcommitment). This is achieved by allocating data blocks on demand from a thin pool, rather than reserving them at creation time. The thin pool itself must have sufficient physical storage to accommodate actual writes, but the logical volume size can exceed the pool's capacity.
What should I do if I get this LPIC-2 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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