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Vmware VCP-410 Study Question

I'm study for my VCP 4.0 using some study guides that I purchased. One of the questions is as follows:

Virtual Disks created on NFS datastores are:
A. in a format dictated by the NFS Server
B. zeroedthick
C. thin
D. Thick
Answer: A

I beleive thw answer shold be C - thin

What are peoples thoughts on this can you explain??
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compdigit44
Asked:
compdigit44
2 Solutions
 
Danny McDanielClinical Systems AnalystCommented:
the official line (or something like it) says that the default, as set by the NFS server, is to use thin provisioned
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Interesting question, and remember the exam is based on what it's the documentation.

Thin disks are often the default choice on Network File System (NFS) data stores. But their appropriateness is determined by the allocation policy of the NFS server and not the VMware ESX server.
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serchlopCommented:
I think the right answer is C.

In the document "Best Practices for running VMware vSphere on Network Attached Storage" say "Virtual disks (VMDKs) created on NFS datastores are in thin provisioned format by default."
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Configuration Guide and Best Practices

Read the guide to learn how to orchestrate Data ONTAP, create application-consistent backups and enable fast recovery from NetApp storage snapshots. Version 9.5 also contains performance and scalability enhancements to meet the needs of the largest enterprise environments.

 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
B C and D are all correct, because NFS may support zeroed Thick, Thick and Thin.

But you are being examined about what is in the official VMware documentation.

So the answer "in a format dictated by the NFS Server" is a close approxmation to

"But their appropriateness is determined by the allocation policy of the NFS server and not the VMware ESX server."

it's one of those questions, where you really need to know the docs, word for word.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
no it's A.

Thin disks are often the default choice on Network File System (NFS) data stores. But their appropriateness is determined by the allocation policy of the NFS server and not the VMware ESX server.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
the words are "often" that does not mean always or default!

But their appropriateness is determined by the allocation policy of the NFS server and not the VMware ESX server.

what is being said is it's the NFS server which dictates it, nothing to do with VMware!
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Danny McDanielClinical Systems AnalystCommented:
if you go to the link I gave above and click on virtual disk formats, you'll see:

About Virtual Disk Formats
When you perform certain virtual machine management operations, such as create a virtual disk, clone a virtual machine to a template, or migrate a virtual machine, you can specify a format for the virtual disk file.
The following disk formats are supported. You cannot specify the disk format if the disk resides on an NFS datastore. The NFS server determines the allocation policy for the disk.
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compdigit44Author Commented:
Wow, great answers everyone..
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Good Luck with Exam. Any other questions just ask.
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