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Any event that has a negative impact on a company's business continuity or finances is a disaster
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Disaster recovery (DR) is about preparing for and recovering from a disaster
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What kind of disaster recovery?
- On-premise => On-Premise: traditional DR and very expensive
- On-Premise => AWS cloud: hybrid recovery
- AWS Cloud Region A => AWS Cloud Region B
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Disaster Recovery Strategies
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Backup and Restore
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Pilot Light
- small version of the app is always running in the cloud
- Useful for the critical core (Pilot Light)
- Very similar to Backup and Restore
- Faster than Backup and Restore as critical systems are already up
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Warm Standby
- Full system is up and running, but at minimum size
- Upon disaster we can scale to production load
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Hot Site/ Multi Site Approach
- Very low RTO (minutes or seconds) - very expensive
- Full production scale is running AWS and On Premise
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- When Multi-AZ Enabled, DMS provisions and maintains a synchronously stand replica in a different AZ
- Advantages:
- Provide Data Redundancy
- Eliminates I/O freezes
- Minimizes latency spikes
- Advantages: