To ensure business continuity, an enterprise will deploy and implement intra-city disaster recovery for W-E-A...

Use ELB for service access load control, set the weight of the backend server, and under normal circumstances, 100% weight matches the production center. In the event of a disaster, 100% weight is matched to the disaster recovery center

Web services and application servers are synchronized through SDRS Storage Synchronization Service

Use RDS Database Service on the cloud to deploy primary/standby across AZs and synchronize data across AZs

The intelligent DNS service is used to control the traffic of business access traffic and 100% of the user traffic is diverted to the production center under normal conditions, and 100% of the user traffic is switched to the disaster recovery center when the production center fails