SP2013 HADR

References:

http://technet.microsoft.com/en-us/library/cc748824.aspx

http://technet.microsoft.com/en-us/library/ff628971.aspx

http://technet.microsoft.com/en-us/library/jj715263.aspx

http://technet.microsoft.com/en-us/library/jj841106.aspx

SQL AlwaysOn with SP2013

http://technet.microsoft.com/en-us/library/jj715261.aspx