Scale up pattern
The scale up pattern is a method that allows a server to change size and specifications dynamically, and as needed. Imagine a running web instance that does a bit of computation per request. Initially, it performs extremely well, but over time traffic becomes heavier and causes the computation time to increase. A couple of options exist to solve this problem, but all have their own benefits and issues.
One option could be to spin up a second instance (or scale outwards), but this means double the cost, as well as any maintenance required to be performed on each server. For applications in the Cloud, it is important not only to think of the cost involved in the server, but also the implied costs, such as operational. The easiest solution might be to change the specs on the current server or scaling up. A benefit of this method is that, if the processing peak can be predicted, such as the beginning of the month or the end of the month transactions, this method can be automated...
