What is Scalability?

Scalability Testing, part of the battery of non-functional tests, is the testing of a software application for measuring its capability to scale up or scale out in terms of any of its non-functional capability.Performance, scalability and reliability are usually considered together by software quality analysts.Scalability testing tools exist (often leveraging scalable resources themselves) in order to test user load, concurrent connections, transactions, and throughput of many internet services. Of the available testing services, those offering API support suggest that environment of continuous deployment also continuously test how recent changes may impact scalability.

What are the basic setting to be made in controller in order to test scalability of AUT?

View the tutorial that comes with LR. You will learn a great deal by completing the complete tutorial. This question is far to broad for this forum. Please ask specific questions