350-601 Storage Network Practice Question
A storage array supports RAID-5, RAID-6, and RAID-10. The array has 12 disks of equal size. The requirement is to maximize usable capacity while tolerating up to two simultaneous disk failures without data loss. Which RAID level should be chosen?
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-6
RAID-6 can tolerate two disk failures with parity overhead of 2 disks, providing high usable capacity. RAID-5 tolerates only one failure; RAID-10 tolerates multiple failures but capacity is 50%.
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-10
Why it's wrong here
RAID-10 provides high fault tolerance but only 50% usable capacity.
- ✗
RAID-5
Why it's wrong here
RAID-5 tolerates only one disk failure.
- ✓
RAID-6
Why this is correct
RAID-6 tolerates up to two failures with better capacity efficiency than RAID-10.
- ✗
RAID-0
Why it's wrong here
RAID-0 has no redundancy.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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