How many fault domains can exist in a single availability domain within OCI?

In Oracle Cloud Infrastructure (OCI), an availability domain is designed to provide a high level of availability and resilience for applications. To achieve this, each availability domain is divided into fault domains. The correct answer reflects that there can be up to three fault domains within a single availability domain.

This setup allows for redundancy and fault tolerance; if one fault domain is affected by an issue, the other fault domains remain operational, thus reducing downtime for applications and services distributed across the fault domains. This design enhances the overall reliability of services deployed in OCI, allowing for various configurations and resource distributions tailored for high availability.

Understanding fault domains is critical for architects working with OCI, as it directly influences how you structure applications and workloads to minimize the impact of potential outages. Keeping workloads balanced across multiple fault domains also helps ensure that even in the case of a failure in one area, others can still function, thereby maintaining overall application performance and reliability.