Finally, ESRI has made their system design strategies available at online for easy reading. Link is here
Every time they have updated the document continously with different updates. This is one of the best document /reference guide for ESRI developers. Any performance issue or network issue or security issue first document to refer is SDS. I suggest to all ESRI developers to have a look on this before starting any project. This is handy document during design phase of any GIS application development project
Recently, white paper on High- Capacity Map Services with use case with CORINE land cover data helped me lot on testing my application which uses huge data.
Hope this message helps many of fellow ESRI developers