VCP-DCV vSphere Architecture, Products and Solutions Practice Question
A vSAN cluster uses a storage policy with FTT=2 (RAID-6). Each object is 256 GB. What is the minimum usable capacity required to store 10 such objects, accounting for overhead?
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
✓
6.4 TB
FTT=2 RAID-6 requires 3 copies (data + 2 parity). For 256 GB objects, total raw capacity per object = 768 GB. For 10 objects, raw = 7680 GB. With default overhead (~1.2x), usable is about 6.4 TB. Option A ignores overhead, B underestimates, D overestimates.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
5.12 TB
Why it's wrong here
This is with FTT=1 RAID-1.
- ✗
2.56 TB
Why it's wrong here
This assumes no replication overhead.
- ✓
6.4 TB
Why this is correct
RAID-6 with overhead gives approximately 6.4 TB usable.
- ✗
10.24 TB
Why it's wrong here
This is overestimated; would be for FTT=3.
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 VCP-DCV practice question is part of Courseiva's free VMware 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 VCP-DCV exam.