Difference Between High Availability and Fault Tolerance

The ability to resolve failures and continue service, requiring preparation for failure scenarios.

The ability to continue service even in the event of a failure, requiring an architecture that is unaffected by failure scenarios.

Literally, recovering from a failure.

Scalability and Elasticity #

The ability to easily and quickly increase scale.

Primarily, expanding computing power or capacity based on demand.

The ability to expand or contract computing power/capacity based on demand.

An essential ability for cost optimization by avoiding the use of unnecessary resources.