Your system has a Home Region, which is the data region that it was initially provisioned at. This will be referred to as the System Home Region. When cross regional disaster recovery is enabled for your system it will have a designated disaster recovery (DR) region. The disaster recovery region is the data region that your system will be switched to in case your home region is no longer available. This will be referred to as the System Disaster Recovery Region.

Your Oracle Cloud Infrastructure (where your Object Storage resides) also has a home region, that will be referred to as the OCI Home Region. In addition to that, your Object Storage might reside in a different region than your OCI Home Region (Object Storage is a regional service and any cloud account can subscribe to more than one region) the region where your Object Storage will reside and be used for your system will be referred to as Object Storage Home Region.

Home regions examples:

If your system has a designed disaster recovery region, it will make sense for your object storage to have a designated disaster recovery region as well, which will be referred to as the Object Storage Disaster Recovery Region.

In most cases the System Home Region will be the same as the Object Storage Home Region but it could be different if it was chosen to be different. The same is true for the System Disaster Recovery Region and the Object Storage Disaster Recovery Region. Selecting an Object Storage Disaster Recovery Region will be covered in the next section.