Model 4: Active-Passive
Active-Passive is one of the most commonly used disaster recovery architectures in enterprise environments.
The primary site actively serves all users while the disaster recovery site remains fully prepared to take over during an outage. Applications, databases, storage, and networking services are continuously synchronized between both locations.
User Ingress
PRODUCTION LINK
All Users Routed Here
Active Site (Primary)
Serving Live Traffic
Applications
Database
Storage
REAL-TIME OPENSTACK VOLUME REPLICATION
Passive Site (Standby)
Ready for Failover
Standby Compute
Replica DB
Replica Storage
Advantages
- Extremely fast recovery time with zero structural delay.
- Highly predictable failover process managed cleanly via Neutron virtual routers.
- Widely adopted and trusted enterprise model for mission-critical operations.
- Provides an excellent balance between absolute data resilience and architectural stability.
Typical Recovery Targets
- RPO (Recovery Point Objective): Near Zero
- RTO (Recovery Time Objective): Minutes
- Cost Metric: High (Dual Cluster Overhead)
Recommended For
- Enterprise banking platforms
- Sovereign government infrastructure networks
- Core healthcare registry databases
- High-load transaction engines