What is Scalability?

The ability to handle more requests by buying a bigger machine or buying more machines is called scalability.

Vertical Scaling

Vertical scaling refers to using a bigger machine and adding more power (like CPU, RAM, network bandwidth or storage) to handle requests much faster.

For example, let’s say your current system has an 8-core server capacity limit. You can upgrade it to a 32-core server with faster SSD storage.

Pros

It is easier to implement.

Upgrading hardware is easier than setting up brand-new servers.

Easier maintenance.

No load balancer is required because there is only a single machine.

Data consistency is easier to maintain.

Communication is inter-process, which is faster.

Cons

We cannot keep making the machine bigger and bigger. Hardware limits come into the picture.

Single point of failure - if one machine goes down, the entire website/app goes down.

Horizontal Scaling

Horizontal scaling means buying more machines.…