LPIC-2 Practice Question: Block Devices, Filesystems and Advanced Storage
Which TWO statements about LVM thin provisioning are correct?
⚠ Common exam trap
Watch out — candidates often 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.
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
✓
It allows creating logical volumes that can be larger than the available physical storage.
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.
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.
- ✗
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.
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