VCP-DCV Configure and Manage vSphere Storage Practice Question
Which TWO statements are true regarding vSAN deduplication and compression?
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
✓
They are disabled by default on new vSAN clusters
vSAN deduplication and compression are disabled by default on new vSAN clusters (option B is correct). They require an all-flash vSAN configuration, meaning all capacity devices must be SSDs (option D is correct). Option A is incorrect because deduplication and compression are enabled at the disk group level, not cluster level. Option C is incorrect because they can also be used with RAID-5/6 erasure coding policies, not just RAID-1 mirroring. Option E is incorrect because compression cannot be enabled independently; if compression is enabled, deduplication is also enabled.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
They are enabled at the vSAN cluster level
Why it's wrong here
They are enabled per disk group.
- ✓
They are disabled by default on new vSAN clusters
Why this is correct
They must be explicitly enabled.
- ✗
They can only be used with RAID-1 mirroring policies
Why it's wrong here
They work with erasure coding as well.
- ✓
They require an all-flash vSAN configuration
Why this is correct
Dedup and compression require flash capacity devices.
- ✗
Compression can be enabled independently of deduplication
Why it's wrong here
Compression requires deduplication to be enabled first.
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.