Scale-out involves running an 
               		 
               		Enterprise Server for .NET installation across multiple, clustered machines. In a cluster environment: 
               	 
            
 
            	 
             
               		
               - The setup uses a single Microsoft SQL Server installation that operates on one or more machines. 
                  		
               
  
               		
               - The setup uses a load balancer to distribute processing between machines in the cluster. 
                  		
               
  
               	 
            
 
            	 
             The machines in the cluster can be either physical or virtual. 
               	 
            
 
            	 
            Scaling out involves: 
               	 
            
 
            	 
             
               		
               - Setting up an installation to run on multiple machines. 
                  		
               
  
               		
               - Setting up network load balancing to define the cluster. 
                  		
               
  
               		
               - Configuring the service endpoints, that is configuring the locations of the various 
                  		  Enterprise Server for .NET services operating on the cluster machines, so that they can communicate with each other. 
                  		
               
  
               		
               -  Configuring network load balancing to handle distribution of traffic.