This image shows a stretched cluster topology across two Oracle Cloud Infrastructure (OCI) regions (primary and standby) with all web servers in Region 1 in a failure state.

The architecture has the following components:

• Region 1 (Primary): Includes a single virtual cloud network (VCN) with a dynamic routing gateway (DRG) to facilitate remote peering and 4 subnets:
  • Web tier Subnet: Oracle Cloud Infrastructure Load Balancer manages traffic to WebHost1 and WebHost2. Both servers are in a failure state.
  • Midtier Subnet: AppHost1 and AppHost2 run the application tier.
  • Shared Storage Subnet: Oracle Cloud Infrastructure File Storage provides shared storage.
  • Database Subnet: DBHost1 and DBHost2 host the primary database (Primary DB).
• Region 2 (Standby): Includes a single virtual cloud network (VCN) with a DRG to facilitate remote peering and 4 subnets:
  • Web tier Subnet: OCI Load Balancer manages traffic to WebHost3 and WebHost4.
  • Midtier Subnet: AppHost3 and AppHost4 run the application tier.
  • Shared Storage Subnet: OCI File Storage provides shared storage.
  • Database Subnet: StandbyDBHost1 and StandbyDBHost2 host the standby database (Standby DB).
• Connectivity and data movement
  • frontend.example.com directs requests to OCI Load Balancer in each region.
  • Remote peering links the DRG in Region 1 with the DRG in Region 2.
  • Oracle Data Guard replicates from the primary database to the standby database.