Night 22, I am going strong and still studying.  Bruce here!  Tonight I am looking at Scale-Out File Servers.  Sometimes known as Active-Active.  Scale-Out File Servers is a great choice when your applications keeps files open for a long amount of time, like Hyper-V virtual hard disk or SQL Server database files.  It is going to be a bad choice for scenario like information workers that generate lots of metadata operation (opening, closing, creating, or renaming files).   It appears we also call this Continuously Available File Server too.  Below are some links I used to learn about Scale-Out File Servers:

Scale-Out File Server for Application Data Overview

http://technet.microsoft.com/en-us/library/hh831349.aspx

Plan for Scale-Out File Server

http://technet.microsoft.com/en-us/library/jj134258.aspx

Deploy Scale-Out File Server

http://technet.microsoft.com/en-us/library/hh831359.aspx

Continuously Available File Server: Under the Hood (Video)

http://northamerica.msteched.com/topic/details/2012/WSV410#fbid=Yesz_YUD4Lk