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4.3.1. DR Metrics and Sites
DR Metrics:
| Metric | Measures | Example |
|---|---|---|
| RPO (Recovery Point Objective) | Maximum acceptable data loss | "We can lose 1 hour of transactions" |
| RTO (Recovery Time Objective) | Maximum acceptable downtime | "We must be operational in 4 hours" |
| MTTR (Mean Time to Repair) | Average repair duration | Used for planning and SLAs |
| MTBF (Mean Time Between Failures) | Average uptime between failures | Reliability metric for components |
Business Impact Analysis (BIA): Identifies critical business functions and quantifies the cost of losing each one (for example, lost revenue per hour of downtime). The BIA's results drive the RTO and RPO set for each system.
DR Site Types:
| Type | Readiness | Cost | Typical RTO |
|---|---|---|---|
| Cold | Empty space with power, cooling | Low | Days to weeks |
| Warm | Hardware installed, needs current data | Medium | Hours to day |
| Hot | Fully operational, real-time data replication | High | Minutes to hours |
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Written byAlvin Varughese
Founder•20 professional certifications