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Setting up your application across multiple fault domains is a way to configure high availability for an application in an OCI region with a single availability domain. A fault domain is a logical grouping of hardware and infrastructure within an availability domain that is designed to be isolated from failures in other fault domains. Fault domains let you distribute your instances so that they are not on the same physical hardware within a single availability domain. This reduces the impact of hardware failures, power outages, or network issues on your application availability and performance. Each availability domain has three fault domains, regardless of the number of availability domains in a region1

Service Plane is NOT an SLA provided by OCI. See the table below:

Oracle Cloud Infrastructure File Storage service provides a durable, scalable, secure, enterprise-grade network file system. You can connect to a File Storage service file system from any bare metal, virtual machine, or container instance in your Virtual Cloud Network (VCN). You can also access a file system from outside the VCN using Oracle Cloud Infrastructure FastConnect and Internet Protocol security (IPSec) virtual private network (VPN).

Large Compute clusters of thousands of instances can use the File Storage service for high-performance shared storage. Storage provisioning is fully managed and automatic as your use scales from a single byte to exabytes without upfront provisioning.

Cloud Horizontal Scaling refers to provisioning additional servers to meet your needs, often splitting workloads between servers to limit the number of requests any individual server is getting. In a cloud-based environment, this would mean adding additional instances instead of moving to a larger instance size.

Cloud Vertical Scaling refers to adding more CPU or memory to an existing server, or replacing one server with a more powerful server.