Scalability
A system needs to be able to handle an increasing load in order for the business to stay attractive to customers. The response times need to be kept down for each individual user and the total throughput needs to increase as the amount of transactions increase. We say that the system needs to scale to the load, and scalability is the capability that the system needs in order to increase total throughput.
When a system needs to be scaled, there are two major disciplines that can be followed: vertical scaling and horizontal scaling. Vertical scaling (or scaling up), as shown in the following diagram, involves adding more hardware resources, such as processor cores and memory, to an existing computer. This was the prevalent way to scale ...
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