Hands-On Software Engineering with Python

Physical architecture

The primary difference between logical and physical architecture documentation is that, while logical architecture's concerns end with identifying functional elements of the system, physical architecture takes an additional step, specifying actual devices that those functional elements execute on. Individual items identified in logical architecture may reside on common devices, physically. Really, the only limitations are the performance and capabilities of the physical device. This means that these different physical architectures are all logically identical; they are all valid ways of implementing the same three-tier web application's logical architecture:

With the current enthusiasm for virtualization, serverless, ...