03-03 Fault Tolerance

Last updated Aug 17, 2023 Edit Source

A Fault Domain is a section of a network that is vulnerable to damage if a critical device or system fails. The purpose of a fault domain is that if a failure occurs it will not cascade outside that domain, limiting the damage if possible. ^1275f6

You can have fault domains nested fault domains.

A fault level is a collection of fault domains. ^d4ef9c

The scope of a fault domain could be:

• specific servers in a rack
• an entire rack in a datacenter
• the entire data center building
  Its up to the CSP to define the boundaries of a domain.

E.g.
an AWS Region would be a Fault Level.
an Availability Zone would be a Fault Domain.