350-601 Storage Network Practice Question
A storage array is configured with RAID 10 across 8 disks. How many disks can fail without data loss, assuming optimal configuration?
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
✓
4
RAID 10 mirrors data across two sets and stripes. In a configuration of 8 disks (4 mirrors), one disk per mirror can fail, so up to 4 disks can fail as long as no mirror loses both disks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
8
Why it's wrong here
If all disks in a mirror fail, data is lost; cannot exceed the number of mirrors.
- ✗
1
Why it's wrong here
RAID 10 can tolerate more than one failure if in different mirrors.
- ✗
2
Why it's wrong here
Up to 4 can fail if each failure is in a separate mirror.
- ✓
4
Why this is correct
In RAID 10 with 8 disks, up to 4 disks (one per mirror) can fail.
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
This 350-601 practice question is part of Courseiva's free Cisco 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 350-601 exam.