The correct first step is to use the vmkfstools command to re-register the virtual disk. When a VM is disconnected from its virtual disk but the .vmdk file remains on the datastore, the root cause is typically a corrupted or missing disk descriptor file—the small text file that points to the raw data in the flat.vmdk. The vmkfstools utility with the -fix option repairs this descriptor, restoring the link between the VM and its disk without needing to recreate the VM or manually reattach the disk. On the VCP-DCV exam, this scenario tests your understanding of virtual disk architecture and command-line recovery tools; a common trap is assuming you must reattach the disk through the vSphere Client or rebuild the VM entirely. Remember the memory tip: "Descriptor down? vmkfstools -fix to re-register the crown." This reinforces that the descriptor file is the crown jewel connecting the VM to its data, and vmkfstools is the repair tool.
VCP-DCV Configure and Manage vSphere Storage Practice Question
This VCP-DCV practice question tests your understanding of configure and manage vsphere storage. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A vSphere administrator is troubleshooting a VM that has been disconnected from its virtual disk. The VM's virtual disk file (vmdk) is still present on the datastore, but the VM cannot be powered on. Which step should the administrator take first to resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the vmkfstools command to re-register the virtual disk.
Option C is correct because when a VM is disconnected from its virtual disk but the .vmdk file remains on the datastore, the issue is often a corrupt or missing disk descriptor file. The vmkfstools command with the -fix option can repair the descriptor file, re-establishing the connection between the VM and its virtual disk without requiring VM recreation or manual re-attachment.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 new VM and attach the existing vmdk file.
Why it's wrong here
This is possible but not the first step; re-registering is simpler.
✗
Re-add the virtual disk from the datastore browser to the VM.
Why it's wrong here
The disk may not appear in the inventory if the descriptor is missing.
✓
Use the vmkfstools command to re-register the virtual disk.
Why this is correct
vmkfstools -i can recreate the descriptor file from the flat vmdk.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Perform a storage vMotion of the VM to another datastore.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the disk must be manually re-attached via the GUI (Option B), but vSphere requires the descriptor file to be intact for the disk to be recognized, and vmkfstools is the proper tool to repair it without data loss.
Detailed technical explanation
How to think about this question
A virtual disk in vSphere consists of a small descriptor file (flat .vmdk) that contains metadata (disk geometry, CID, parent CID for snapshots) and a large flat file containing the actual data. If the descriptor file becomes corrupted or orphaned, the VM loses its reference to the data file. The vmkfstools -fix command rebuilds the descriptor file by scanning the flat file and regenerating the metadata, effectively reconnecting the disk. In real-world scenarios, this often occurs after a storage array failover or improper snapshot deletion.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the VCP-DCV exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Configure and Manage vSphere Storage — This question tests Configure and Manage vSphere Storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the vmkfstools command to re-register the virtual disk. — Option C is correct because when a VM is disconnected from its virtual disk but the .vmdk file remains on the datastore, the issue is often a corrupt or missing disk descriptor file. The vmkfstools command with the -fix option can repair the descriptor file, re-establishing the connection between the VM and its virtual disk without requiring VM recreation or manual re-attachment.
What should I do if I get this VCP-DCV question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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