Horizontal Scaling or Vertical Scaling

Of course horizontal scaling will be better but as always, application must support this design.
Monolithic applications can be hard to scale horizontally.
Parallel-running applications like microservices can fit horizontal scaling much easier.
Additionally, application nature is so important.
If there occurs a high communication need between the nodes when scaled horizontally, this heavy communication overhead may also be a performance problem and you may prefer scaling vertically instead.

Vertical scaling is always easier. But as we all know, when you give 2 times CPU, your performance does not scale twice. Because performance is an overall value from both usage patterns, application behaviours, cpu-memory-disk-network all resource usages together etc etc. Application patterns are other examination issues but we want to focus on hardware architecture for better vertical scaling. SPARC is abbreviation of “Scalable Platform ARChitecture.” SPARC hardware design cares scalability for decades. For example, When you give 2 times CPU resources, you generally gain 1.3 times performance. But SPARC aims maximizing this gain near to 2. It wont be 2 but the nearest maximum is valuable for scalability. If you gain 1.7 or 1.8 times performance due to 2 times CPU resource, it is SPARC’s design success for better vertical scaling instead gaining classical average 1.3 times performance.

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