VCP-DCV Configure and Manage vSphere Storage Practice Question
Exhibit
Refer to the exhibit. vmkfstools -P -v10 /vmfs/volumes/datastore1/vm1/vm1.vmdk Output: DISKOPEN: /vmfs/devices/disks/naa.6000c29a1b2c3d4e:1: Size 17179869184 (512 bytes sectors) DISKOPEN: /vmfs/devices/disks/naa.6000c29a1b2c3d4e:2: Size 8589934592 (512 bytes sectors) DISKOPEN: /vmfs/devices/disks/naa.6000c29a1b2c3d4e:3: Size 4294967296 (512 bytes sectors) vmfs version: 6.82 capacity: 17179869184 (16.0 GB) format: 3 (vmfs6) number of extents: 3
An administrator runs vmkfstools on a VMFS datastore and receives the output shown. The datastore is backed by a single LUN from a SAN array. What is the most likely explanation for the multiple extents shown?
⚠ Common exam trap
A common mix-up: candidates confuse multipathing (multiple paths to a LUN) with multiple extents, or assume that VMFS6's sub-block allocation creates extents for VMDK files, when in fact extents are a datastore-level construct, not a virtual disk feature.
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
✓
The datastore was expanded by adding an extent from the same LUN.
When a VMFS datastore is expanded using the same LUN, vmkfstools can show multiple extents because the additional space is added as a separate extent on the same physical LUN. This is a common practice to grow a datastore without reprovisioning a new LUN, and the output reflects the original and expanded extents both pointing to the same LUN identifier.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The LUN was presented to the host with multiple paths, and each path is treated as a separate extent.
Why it's wrong here
Multiple paths to the same LUN do not create separate extents; they appear as the same device with multiple paths.
- ✓
The datastore was expanded by adding an extent from the same LUN.
Why this is correct
When expanding a VMFS datastore, the system can add extents from the same LUN, leading to multiple extents as shown.
- ✗
The datastore is a VMFS6 datastore with three logical volumes aggregated into one namespace.
Why it's wrong here
VMFS6 does not aggregate logical volumes; extents are from the same physical LUN.
- ✗
The virtual machine has a large VMDK file that spans multiple extents due to VMFS6 sub-block allocation.
Why it's wrong here
Large VMDK files are stored as a single file on VMFS6; sub-blocks are for small files, not extents.
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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.