I. High Availability:
Similar to having a spare tire in a car, high availability ensures a quick recovery from a component failure. The system has a backup ready to replace the failed component, minimizing downtime.
II. Fault Tolerance:
Like an airplane with multiple engines, a fault-tolerant system can continue operating even if one or more components fail. The system is designed to have redundancy, ensuring that the loss of a single component doesn't bring the entire system down.
III. Disaster Recovery:
This is like the pilot ejecting from a failing aircraft. In a disaster scenario, the entire infrastructure is compromised. Disaster recovery focuses on saving the business's data and operations by moving them to a new, unaffected infrastructure. It's about preserving the business, not the infrastructure itself.
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