System Landscape - re post

System Landscape:
The system landscape contains all systems that were installed. The customer can choose any landscape according to the requirements.
If the customer is very big, one can implement four system landscapes. Mid size customers can go for two system landscape.
Now we will see different system landscapes:
Four system landscape:

In this landscape, we will find four systems,
1) development system
2) test system
3) pre production system
4) production system
In development system, we find three clients
100
140
180
100 can be used as configuration client. 140 can be used for development. 180 can be used for testing purpose in development system.
The Test system contains two clients
010
040
010 can be used for testing, where as 040can be used for training purposes.
The pre production system is the one which behaves exactly as production system. It contains data similar to production system. We can test with similar production data.
Production system contains one client where the end users will be working with real time data supporting day to day business.

Three system landscape, we will find each dedicated server for development, test and production systems. You can assume the clients like above.

Two system landscape, the development and test systems are combined into one system.
One client can be used for development and another can be used for quality.
In any landscape, production system will be installed on dedicated server.
One system landscape is not recommended, where all three systems can be installed in a single system.