This post covers the overview and concept of Availability Domain & Fault Domain in Oracle Cloud Infrastructure (OCI).

Note: OCI is part of IaaS Service model (other 2 Cloud Service models are SaaS & PaaS), where OCI is re-branding of Bare Metal Cloud Service (BMCS).

Another offering in IaaS from Oracle is OCI-Classic (or OCI-C) and to find the difference between two and when to use what, Check our previous post on  OCI vs OCI-C here

Before we will deep-dive into Availability Domain (AD) & Fault Domain (FD), let understand the concept of Region in Oracle Cloud Infrastructure (OCI)

Region in Oracle Cloud Infrastructure(OCI)

OCI Servers & Data is hosted in a region where the region is a localized geographic area, as of August 2019, there are 11 regions for OCI i.e. London, Frankfurt, Ashburn, Phoenix, Toronto, Tokyo, Seoul, Mumbai, Zurich, Sao Paulo & Sydney.

• You can have OCI resources (Compute, Network, Storage) in multiple Regions
• When you create Tenancy (Account in Cloud) a Home Region is selected and later you can add more Regions

Note: For a full list of Oracle Cloud Regions including PaaS & IaaS check https://cloud.oracle.com/data-regions

Availability Domain (AD)

Availability Domain (AD) is one or more data centers located within a region. A region is composed of three availability domains. Services/Resources  are either Region-Specific (like VCN) or Availability Domain Specific (like Compute)

Note: All the available domains in a region are connected to each other by a low latency, high bandwidth network, which makes it possible for you to provide high-availability connectivity to the Internet and customer premises, and to build replicated systems in multiple availability domains for both high-availability and disaster recovery wherein Regions are completely independent of other regions and can be separated by vast distances—across countries or even continents

Fault Domains in Oracle Cloud Infrastructure (OCI)

A fault domain is a grouping of hardware and infrastructure within an availability domain. Each availability domain contains three fault domains. Fault domains let you distribute your instances so that they are not on the same physical hardware within a single availability domain. A hardware failure or Compute hardware maintenance that affects one fault domain does not affect instances in other fault domains.

Use fault domains to:

• Protect against unexpected hardware failures
• Protect against planned outages due to Compute hardware maintenance

Note: Fault domains are available at no additional cost in all public region

For Best Practices See Fault Domains Best Practices for Your Compute Instance

Related/Further Readings

If you are just a beginner to Oracle cloud, then check our below posts to start your journey:

• 7 Days FREE Trial to Start Your Oracle Cloud Journey
• [Video]: Oracle Cloud Infrastructure (OCI) | Storage Object, Block | File Storage, Data Transfer Service
• [Video] Oracle Cloud Infrastructure (OCI)  Compute CPU & Memory
• Amazon AWS or Oracle Cloud (Confused ?): Right Choice for DBA’s
• Role of Oracle Apps DBA in Cloud

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