LPIC-2 Practice Question: Block Devices, Filesystems and Advanced Storage
Which THREE of the following are correct statements about LVM thin provisioning? (Select THREE)
⚠ Common exam trap
Many candidates confuse thin pool resizing with standard logical volume resizing, assuming lvreduce can shrink a thin pool safely, when in fact LVM does not support shrinking thin pools without risking data loss.
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
✓
Snapshots of thin volumes use the same pool.
LVM thin provisioning uses a shared thin pool to store data for all thin volumes and their snapshots. When a snapshot of a thin volume is created, it does not allocate separate physical storage; instead, it references the same thin pool, allowing efficient space usage and copy-on-write semantics.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Snapshots of thin volumes use the same pool.
Why this is correct
Both thin volumes and snapshots share pool space.
- ✓
Thin provisioning allows overcommitment of physical storage.
Why this is correct
This is the main advantage.
- ✗
A thin pool can be resized smaller without data loss.
Why it's wrong here
Shrinking a thin pool may cause data loss.
- ✓
A thin volume can be larger than the pool.
Why this is correct
Overcommitment is allowed.
- ✗
Thin volumes must be created before the thin pool.
Why it's wrong here
Pool must be created first.
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