LFCS Storage Management Practice Question
Which three RAID levels are commonly supported in Linux software RAID? (Choose three.)
⚠ Common exam trap
It's easy for candidates to assume RAID 6 is one of the three most common levels because it is widely used, but the LFCS exam specifically tests knowledge that RAID 0, 1, and 5 are the three traditionally and most commonly supported levels in Linux software RAID, with RAID 6 being an extension rather than a core level.
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
✓
RAID 0
RAID 0 (striping) is supported in Linux software RAID via the md (multiple device) subsystem, providing improved performance by distributing data across multiple disks without redundancy. It is a standard RAID level implemented in the Linux kernel's md driver.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
RAID 0
Why this is correct
Striping without redundancy.
- ✓
RAID 1
Why this is correct
Mirroring for redundancy.
- ✓
RAID 5
Why this is correct
Striping with distributed parity.
- ✗
RAID 4
Why it's wrong here
RAID 4 is less common due to dedicated parity disk bottleneck.
- ✗
RAID 6
Why it's wrong here
RAID 6 is supported but not as common as RAID 5.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.