You are an Enterprise administrator for contoso.com. All the servers in the domain run Windows Server 2008. The company consists of 10,000 computers.

Which of the following options would you choose to design a storage architecture for Windows Server Update Services (WSUS) updates to ensure that the WSUS updates are highly available?

A.
Configure the WSUS servers to use a RAID 0 hardware controller and then store the WSUS updates on each WSUS server.

B.
Use a remote file share to store the WSUS updates.

C.
Store the WSUS updates on a multihomed network file server. Create two host (A) resource records for the WSUS servers.

D.
Store the WSUS updates on a Distributed File System (DFS) link that uses multiple replicating targets.

E.
None of the above

Explanation:

Distributed File System (DFS) is a strategic storage management solution that gives administrators a more flexible way to centrally manage their distributed resources. With DFS, administrators can create simplified views of folders and files, that is, a virtual organization called a namespace, regardless of where those files physically reside in a network.
You should create a single file location that is available to all the front-end WSUS servers. Even if you do not store updates locally, you will need a location for End User License Agreement files. You may wish to do so by storing them on a Distributed File System share.
It is not necessary to use a DFS share with an NLB cluster. You can use a standard network share, and you can ensure redundancy by storing updates on a RAID controller.

Reference: Step 4: Set up a DFS share
http://technet.microsoft.com/en-us/library/cc708533.aspx