350-601 Storage Network Practice Question
A NetApp storage array is configured for synchronous replication between two data centers. The round-trip latency is 2 ms. Which RAID type provides the best balance of capacity efficiency and protection for the primary storage volumes that are replicated?
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-10
RAID-10 offers high performance and availability with mirroring and striping, but capacity efficiency is lower (50% usable). RAID-6 provides better capacity efficiency (2 parity disks) but with higher write overhead. Given synchronous replication, RAID-10 is often preferred for performance.
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-5
Why it's wrong here
RAID-5 uses single parity and may have performance overhead during writes.
- ✗
RAID-6
Why it's wrong here
RAID-6 provides dual parity but has higher write overhead, which may impact synchronous replication.
- ✓
RAID-10
Why this is correct
RAID-10 offers high performance and availability, suitable for synchronous replication despite lower capacity efficiency.
- ✗
RAID-0
Why it's wrong here
RAID-0 provides no redundancy, not suitable for replicated storage.
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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