LPIC-2 Practice Question: Block Devices, Filesystems and Advanced Storage
An administrator wants to create a thin provisioned LVM pool and a thin volume. Which sequence of commands is correct?
⚠ Common exam trap
A common mix-up: candidates confuse the `-T` flag (which can create both thin pools and thin volumes depending on context) with the explicit `--thinpool` and `--thin` flags, and often forget that creating a thin volume requires specifying the pool path (e.g., `vg/pool/thinvol`) and the `--thin` flag, not just a regular `lvcreate` with `-n`.
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
✓
lvcreate -L 10G --thinpool vg/pool; lvcreate -V 5G --thin vg/pool/thinvol
It uses the correct LVM commands to create a thin provisioned pool and a thin volume. The first command, `lvcreate -L 10G --thinpool vg/pool`, creates a thin pool named 'pool' in volume group 'vg' with a 10G metadata and data area. The second command, `lvcreate -V 5G --thin vg/pool/thinvol`, creates a thin volume named 'thinvol' within that pool, specifying the virtual size with `-V`. The `--thinpool` and `--thin` flags are the proper LVM2 syntax for thin provisioning.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
lvcreate -L 10G -T vg/pool; lvcreate -V 5G -T vg/pool/thinvol
Why it's wrong here
-V with -T expects a pool, not a thin volume name.
- ✓
lvcreate -L 10G --thinpool vg/pool; lvcreate -V 5G --thin vg/pool/thinvol
Why this is correct
Correct syntax for thin pool and thin volume.
- ✗
lvcreate -L 10G -T vg/pool; lvcreate -n thinvol -V 5G vg/pool
Why it's wrong here
This also creates a regular volume.
- ✗
lvcreate -L 10G -T vg/pool; lvcreate -V 5G -n thinvol vg/pool
Why it's wrong here
This creates a regular volume, not a thin volume.
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