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High Availability (HA)
A system design protocol that ensures an agreed level of operational performance, usually uptime, for a higher than normal period.
High Availability (HA) refers to systems that are durable and likely to operate continuously without failure for a long time.
Characteristics of HA Systems
- Redundancy: Having multiple instances of a service so one can fail without causing an outage.
- Failover: The ability to automatically switch to a standby instance.
- No Single Point of Failure: Ensuring that the failure of one component doesn't bring down the whole system.
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