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High Availability
Refers to architecture that continue to remain available to end users in the event of component or systems failure. Multiple AZ architecture allow your applications to remain available in the event of an AZ outage.
Fault Tolerance
Architecture that remains available during an outage (high availability) but also suffer no degradation in performance. FT architecture usually require extra redundancy/should be traded off with cost concerns
Scalability and Elasticity
The ability of a system to easily increase in size & capacity in a cost effective way. VERTICAL- increases the capacity of a single instance or server HORIZONTAL- add or terminate number of instances
ELASTICITY system ability to change or adapt.
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