Reply To: Scale up is not the same as upgrade.

[samabc]

Please see [this link](https://en.wikipedia.org/wiki/Scalability#Horizontal_and_vertical_scaling) which is referenced in the link you provided. Scale up and scale out are defined there:

> Scaling vertically (up/down) means adding resources to (or removing
resources from) a single node, typically involving the addition of CPUs,
memory or storage to a single computer.

Upgrading is one way (of many) to scale up. Another way is to plug another CPU into a machine. Upgrading is way to achieve scaling up – it is not itself scaling up.

The concepts are subtly different and IMHO should not be confused.

Thanks,

Sam