Perry Whittle (1/28/2015)

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You are correct a fileshare witness does not hold a full copy of the cluster database, it's really designed for stretched clusters. Since you're not planning this here you maybe don't need a fileshare witness.

Using the 4 nodes, and i think i said this previously, you can still employ Majority Node Set rather than a disk based witness by removing a vote from a specific node. In other words Node1, Node2 and Node3 would all have a cluster vote whereas Node4 would have its vote removed, you don't require a witness then. Quorum disk witnesses are so last century 😀

As i said previously the smart choice is the use of Windows Server 2012 R2, there are some enhancements to the clustering sub system that provide greater resilience.