This LFCS practice question tests your understanding of storage management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which three RAID levels are commonly supported in Linux software RAID? (Choose three.)
RAID 0
Striping without redundancy.
RAID 1
Mirroring for redundancy.
RAID 5
Striping with distributed parity.
RAID 4
Why wrong: RAID 4 is less common due to dedicated parity disk bottleneck.
RAID 6
Why wrong: RAID 6 is supported but not as common as RAID 5.
Answer choices
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Related concept
Read the scenario before looking for a memorised answer.
RAID 1
Why this is correct
Mirroring for redundancy.
Related concept
Read the scenario before looking for a memorised answer.
RAID 5
Why this is correct
Striping with distributed parity.
Related concept
Read the scenario before looking for a memorised answer.
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.
Common exam traps
The trap here is that candidates often 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.
Detailed technical explanation
Linux software RAID is managed by the md (multiple device) driver and the mdadm utility, which supports RAID levels 0, 1, 4, 5, 6, 10, and others, but RAID 4 is rarely used due to its single parity disk bottleneck and is not considered a 'commonly supported' level in typical LFCS contexts. The md driver uses a chunk size (default 512 KB) for striping in RAID 0 and 5, and parity calculations in RAID 5 use XOR operations distributed across all disks to avoid a dedicated parity disk. In real-world scenarios, RAID 5 is chosen for a balance of capacity and redundancy, while RAID 0 is used for performance-critical, non-redundant storage.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the LFCS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Storage Management — This question tests Storage Management — Read the scenario before looking for a memorised answer..
The correct answer is: 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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.
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