LFCS Storage Management Practice Question
Which two statements are true about LVM snapshots? (Choose two.)
⚠ Common exam trap
Watch out — candidates often assume snapshots are read-only (like many other snapshot implementations) or that they require full duplication of the source volume, but LVM snapshots are read-write by default and use copy-on-write to minimize space usage.
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 use copy-on-write technology.
LVM snapshots use copy-on-write (COW) technology, which means that only the data blocks that are changed after the snapshot is created are copied to the snapshot volume. This makes snapshots space-efficient, as they do not duplicate the entire original volume at creation time.
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 require the same amount of space as the original volume.
Why it's wrong here
Snapshots allocate space only for changed blocks, typically much smaller.
- ✗
Snapshots are read-only by default.
Why it's wrong here
LVM snapshots are writable by default.
- ✓
Snapshots use copy-on-write technology.
Why this is correct
COW ensures original data is preserved until overwritten, then copied to snapshot.
- ✓
Snapshots can be used to restore the original volume.
Why this is correct
Merging a snapshot reverts the original volume to the snapshot's state.
- ✗
Snapshots are only supported on ext4 filesystems.
Why it's wrong here
LVM snapshots work with any filesystem.
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Senior Network & Security Engineer · founder of Courseiva
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