If this was a comics style blog it would start like this:

They both stood there, the clean and virtues super-hero MVC and his arch-enemy the dirty and corrupt spaghetti-design-pattern... they were both aware that only one of them will prevail.

When designing enterprise application architecture, talking to clients and doing interviews for my group, I sometimes tackle the “scale up vs. scale out” software architectural dilemma.

To set the stage lets define what scale means as well as what scale-up and scale-out mean.