The image shows administrators on-premises using Site-to-Site VPN or FastConnect with an internet gateway to access an OCI region.

The OCI region contains a production VCN. Inside this VCN is a private subnet (load balancer tier) which contains two load balancers: an active and standby. Traffic from the internet gateway enters this private subnet, and traffic is load balanced. The load balancing tier splits into two availability domains, one active domain and one standby domain.

The two availability domains are almost identical. Each availability domain contains two fault domains and three private subnets (web tier, application tier, and database tier).

The first fault domain in the web tier contains two IBM Sterling Order Management web services. The active availability domain's second fault domain only contains one web service, while the standby availability domain does not have any web services in the second fault domain.

In the application tier there are three IBM Sterling Order Management app services in each fault domain.

The database tier contains one Oracle Exadata Database service, the production database resides in the active availability domain, while the non-production standby database is located in the standby availability domain for disaster recovery.

There is a service gateway within the production VCN that contains app and database backups and connects to Oracle Cloud Infrastructure Object Storage.