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Cloud Computing · Foundational

Fault Domain (FD)

Grouping of hardware and infrastructure within an OCI availability domain; each AD has three fault domains.

Definition

Fault domains provide anti-affinity, letting customers distribute instances so they are not on the same physical hardware, protecting against hardware failures and planned maintenance within an AD.

Example

Three web servers are placed in FAULT-DOMAIN-1, -2 and -3 so a single rack failure affects only one.

Exam tip

In single-AD regions, spreading instances across fault domains is the primary high-availability technique.

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