VMFS access is going to be via a block protocol - ISCSI or FibreChannel.
NFS access will be addressing the Unity as a file server.
vVols can go either way, but requires some up-front configuration on the Unity to provide a capability profile to ESX. ESX then provisions vVols from storage the Unity is presenting via one of the protocols above.
storagtetalk
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Posted September 7th, 2016 10:00
The main difference here is the access method:
VMFS access is going to be via a block protocol - ISCSI or FibreChannel.
NFS access will be addressing the Unity as a file server.
vVols can go either way, but requires some up-front configuration on the Unity to provide a capability profile to ESX. ESX then provisions vVols from storage the Unity is presenting via one of the protocols above.
I recommend reading the following:
https://support.emc.com/docu69882_Unity:-Introduction-to-the-Unity-Platform---A-Detailed-Review.pdf?language=en_US