VCP-DCV Configure and Manage vSphere Storage Practice Question
An administrator needs to attach a SAN LUN to a VM for a clustered application that requires SCSI-3 persistent reservations. The VM will run on two hosts in a cluster. Which storage option should be used?
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
✓
Create a physical mode RDM (Raw Device Mapping).
Physical mode RDM (Raw Device Mapping) supports SCSI-3 persistent reservations and allows sharing the LUN between VMs in a cluster. Virtual compatibility mode (virtual RDM) does not support persistent reservations, so option A is incorrect. Option C (thick-provisioned eager zeroed VMDK on VMFS) does not support persistent reservations because VMDKs are managed by VMFS and cannot pass through SCSI-3 commands. Option D (VVol representing the LUN) may not support persistent reservations in the same direct manner as a physical RDM, and typically requires additional configuration. Therefore, physical mode RDM is the correct choice.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a virtual mode RDM (Raw Device Mapping).
Why it's wrong here
Incorrect: Virtual mode RDM does not support SCSI-3 persistent reservations.
- ✓
Create a physical mode RDM (Raw Device Mapping).
Why this is correct
Correct: Physical mode RDM supports SCSI-3 persistent reservations and cluster applications.
- ✗
Create a thick-provisioned eager zeroed VMDK on VMFS.
Why it's wrong here
Incorrect: VMDK files do not support SCSI-3 persistent reservations.
- ✗
Create a VVol representing the LUN.
Why it's wrong here
Incorrect: VVols are abstracted and do not provide raw LUN mapping.
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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.