Oracle Exam 1Z0-1085-20 Topic 6 Question 10 Discussion

To design a high availability architecture, three key elements should be considered--- redundancy, monitoring, and failover:

1) Redundancymeans that multiple components can perform the same task. The problem of a single point of failure is eliminated because redundant components can take over a task performed by a component that has failed.

2) Monitoringmeans checking whether or not a component is working properly.

3) Failoveris the process by which a secondary component becomes primary when the primary component fails.

The best practices introduced here focus on these three key elements. Although high availability can be achieved at many different levels, including the application level and the cloud infrastructure level, here we will focus on the cloud infrastructure level.

An Oracle Cloud Infrastructureregionis a localized geographic area composed of one or more availability domains, each composed of three fault domains. High availability is ensured by a redundancy of fault domains within the availability domains.

Anavailability domainis one or more data centers located within a region. Availability domains are isolated from each other, fault tolerant, and unlikely to fail simultaneously. Because availability domains do not share physical infrastructure, such as power or cooling, or the internal availability domain network, a failure that impacts one availability domain is unlikely to impact the availability of others.

Afault domainis 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. As a result, an unexpected hardware failure or a Compute hardware maintenance that affects one fault domain does not affect instances in other fault domains. You can optionally specify the fault domain for a new instance at launch time, or you can let the system select one for you.

All the availability domains in a region are connected to each other by a low-latency, high bandwidth network. This predictable, encrypted interconnection between availability domains provides the building blocks for both high availability and disaster recovery.

https://docs.oracle.com/en/solutions/design-ha/index.html#GUID-76ECDDB4-4CB1-4D93-9A6D-A8B620F72369