Basic Terms

High availability

Minimize the outages and downtime and ensuring an agreed level of uptime/downtime.

Ability for a system to remain in operation even if some of the components used to build the system fail.

Ensure that a company can respond to a disaster or other failure that affects systems and minimize the effect on business operations.

2 types of scalability:
- Horizontal Scalability - Increasing your number of resources - Adding - Aka elasticity.
- Vertical Scalability - Making your current resources better - Upgrading.
Being scalable means your app can handle bigger loads/more traffic by either adding more resources (horizontal scaling) or upgrading the current resources (vertical scaling).
Horizontal scaling does not cause any downtime as it doesn't do anything to the instance; it only adds more instances.
Vertical scaling changes the instance itself so it will require a reboot, which will cause downtime.

Last updated 3 years ago