Overview of X8M Scalable Exadata Infrastructure
Oracle Cloud Infrastructure scalable Exadata X8M system model allows you to add additional database and storage servers after provisioning and create a system that matches your capacity needs.
The New Exadata Cloud Service Resource Model
Exadata Cloud Service instances can now be provisioned with a new infrastructure resource model that replaces the DB system resource. In the new model, the DB system is split into two resources, the cloud Exadata infrastructure resource, and the cloud VM cluster resource.
The X8M system model is only compatible with the new resource model. For provisioning new X7 and X8 systems, Oracle recommends using the new resource model so that your instance will not have to be switched to the new resource model later.
Oracle will continue to support the Exadata DB system resource for an interim period (for both Exadata instance creation and management) before the DB system resource is deprecated in the Exadata Cloud Service. Existing Exadata DB systems can be easily switched to the new resource model with no downtime. For instructions on switching, see To switch an Exadata DB system to the new Exadata resource model.
The Cloud Exadata Infrastructure Resource
The infrastructure resource is the top-level (parent) resource. At the infrastructure level, you control the number of database and storage servers. You also control Exadata system maintenance scheduling at the Exadata infrastructure level. This resource is created using the CreateCloudExadataInfrastructure API.
See To add compute and storage resources to a flexible cloud Exadata infrastructure resource for information on scaling the X8M cloud Exadata infrastructure resource. Note that after adding storage or database servers to the infrastructure resource, you must then add them to the system's VM cluster to utilize the new capacity.
The Cloud VM Cluster Resource
The VM cluster is a child resource of the infrastructure resource, providing a link between your Exadata cloud infrastructure resource and Oracle Database. Networking, OCPU count, IORM, and Oracle Grid Infrastructure are configured and managed at the VM cluster level. This resource is created using the CreateCloudVmCluster API.
See To add database server or storage server capacity to a cloud VM cluster for information on adding available storage or database servers to the VM cluster. Note that you must add servers to the infrastructure resource before you can add capacity to the VM cluster.
Exadata Cloud Service instances currently support creating a single cloud VM cluster.
Additional Exadata Cloud Service Instance Resources
The new Exadata resource model retains the rest of the resource types found in DB systems: Oracle Databases, database backups, Data Guard Associations, Work Requests, Oracle Database Homes, and database server nodes (also called "virtual machines").
The database server file system for database server nodes (also known as "virtual machines") has changed with the X8M generation of hardware. See The X8M Virtual Machine File System Structure for details on the X8M database server node file system.