VCP-DCV vSAN Disk Group Practice Question
An administrator is planning a storage upgrade for a vSphere cluster. The cluster currently uses VMware vSAN as the primary datastore. The administrator wants to add capacity to the vSAN datastore without adding additional hosts. Which action should the administrator take?
⚠ Common exam trap
The trap is that candidates might assume replacing disks (Option A) is the only method to increase capacity, overlooking that adding a new disk group (Option C) is a standard and often simpler approach that avoids data migration.
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
✓
Add a new disk group on each host with additional capacity disks
Adding a new disk group on each host with additional capacity disks directly increases vSAN datastore capacity without requiring host replacement. This method allows you to add new capacity disks while preserving existing disk groups and data placement policies. Option A is incorrect because replacing existing disks with larger ones, while possible, typically requires data evacuation or is more disruptive, and it is not the recommended approach when disk slots are available. Option B is invalid because disk groups are per-host; combining disks across hosts is not supported. Option D does not increase vSAN capacity and introduces a different datastore type.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Replace existing disks in each host with larger capacity disks and claim them to the same disk group
Why it's wrong here
Replacing disks with larger ones is a valid method but is typically more disruptive as it may require data evacuation. It is not the recommended approach when disk slots are available.
- ✗
Combine disks from different hosts into a single disk group
Why it's wrong here
A vSAN disk group cannot span hosts; its disks must all be local to one host, so combining disks from different hosts is unsupported. It is tempting because disk groups aggregate multiple physical disks into one pool, which is the right approach when adding local capacity to a single host within the cluster.
- ✓
Add a new disk group on each host with additional capacity disks
Why this is correct
Adding a new disk group with additional capacity disks on each existing host expands the vSAN datastore's usable capacity without provisioning new hosts. vSAN aggregates local disks across cluster members, so each host must contribute disks to increase overall datastore size.
- ✗
Add a new VMFS datastore and use Storage vMotion to move VMs
Why it's wrong here
A VMFS datastore is separate storage, not part of the vSAN datastore, so Storage vMotion relocates VMs without increasing vSAN capacity. It is tempting because Storage vMotion migrates running VMs between datastores without downtime, which is correct when retiring or rebalancing existing storage rather than expanding vSAN.
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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.