LFCS Storage Management Practice Question
A large e-commerce platform runs on a database server that uses LVM thin provisioning. The thin pool is overcommitted at 200% (pool size 1TB, thin volumes total 2TB). Suddenly, the database reports write errors and performance degrades drastically. The administrator checks the system and finds that the thin pool is completely full. What is the immediate effect on the thin volumes, and what should the administrator do to restore normal operation without 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
✓
The volumes become read-only; administrator must add more physical storage to the volume group and extend the thin pool.
When an LVM thin pool is completely full, writes to thin volumes fail and the volumes become read-only to prevent data corruption. This matches option C. The correct action is to add more physical storage to the volume group and extend the thin pool, which will allow normal writes to resume. Option A is incorrect because volumes do not continue to operate; they become read-only. Option B is incorrect because corruption does not occur immediately. Option D is false because thin pools do not auto-extend.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The volumes continue to operate but with severe slowdown; administrator must delete unnecessary snapshots.
Why it's wrong here
Deleting snapshots may free space, but the immediate effect is write failures.
- ✗
The volumes become corrupted; administrator must restore from backup.
Why it's wrong here
Volumes do not corrupt immediately; they go read-only.
- ✓
The volumes become read-only; administrator must add more physical storage to the volume group and extend the thin pool.
Why this is correct
Correct: Thin pool full leads to read-only volumes; extend pool to restore writes.
- ✗
The volumes automatically extend the pool using metadata space; no action needed.
Why it's wrong here
Thin pools do not automatically extend.
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Written by Johnson Ajibi, MSc IT Security
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