This image shows on-premises mainframe-based workloads migrated to Oracle Cloud using Tuxedo ART Workbench. All the resources in the cloud are deployed in a single availability domain in an Oracle Cloud Infrastructure region, and are protected using Cloud Guard.

IPSec VPN or FastConnect provide private connectivity from the customer premises. Tuxedo Mainframe Adapter enables connectivity between the on-premises mainframe and Tuxedo middle tier in the cloud.

The architecture shows two virtual cloud networks (VCNs) in the cloud, interconnected privately using local peering gateways (LPGs):

• VCN 10.0.0.0/16 is in a regular compartment. It is used for the load balancer and the middle tier.
• VCN 192.168.0.0/16 in a security-zone compartment, and is used for the data tier.

Both the VCNs have a NAT gateway, to route one-way traffic from the resources in the private subnets to the internet.

The VCN used for the data tier has a service gateway for access to Oracle Cloud Infrastructure Object Storage.

The load balancer has primary and standby nodes, attached to public subnet 10.0.1.0/24. An internet gateway allows traffic between application users and the load balancer.

The middle tier consists of compute instances that host the following components, distributed across all the fault domains in the availability domain and across two private subnets.

• Four compute instances hosting Tuxedo ART CICS.
• Four compute instances hosting Tuxedo ART Batch.
• Four compute instances hosting Oracle Tuxedo application runtime for IMS.
• Two compute instances hosting Oracle Tuxedo System and Application Monitor (TSAM).

The data tier consists of an active-standby pair of Exadata DB systems, attached to two private subnets for client and backup traffic. Oracle Data Guard is used for data synchronization and failover.