Netapp recommendation is *minimum* one LIF per node for each SVM..
And seperating NAS and SAN SVM's are recommended.
Seperating the NAS LIFs (NFS and CIFS) is depends on the data your cluster is serving.
there are customers who serve same data to NFS and CIFS clients.. in that case there is no advantage in having sperate LIF for each protocol. (unless they are different network)
Its always good to have dedicated network (usually non routable) for ESX datastore.
otherwise, keep it simple, one NAS LIF per node per SVM.
Robin.