In this article we are going to learn about Scalability and its different type. What is Scalability Requirements? How that drives performance testing?

http://www.networkworld.com/article/2161876/tech-primers/how-to-choose-between-scale-up-vs–scale-out-architectures-for-backup-and-recovery.html

Scale UP :

Scale Down :

Horizontal Scaling :

Vertical Scaling :

How to tests?

What are the measurement? 1X, 2X, 5X.

Thanks