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SESK: Stuff Everyone Should Know · sesk.info/tech-redundancy-spof

What reliability problem is redundancy designed to remove?

Redundancy removes single points of failure.

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  1. All software updates
  2. Single points of failure ✔
  3. Every latency spike

Why: A redundant component or replica can preserve a function when one component fails. The replicas must avoid shared dependencies that would make them fail together.

Huh, didn't know that: Redundancy can range from one spare part to a full replica of an application stack.

The dad joke
The server brought a twin so no component had to perform a solo.
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References

Answer: Single points of failure. A redundant component or replica can preserve a function when one component fails. The replicas must avoid shared dependencies that would make them fail together.

  1. AWS Resilience Analysis Framework docs.aws.amazon.com/prescriptive-guidance/latest/resilience-analysis-framework/overview.html
    Fault tolerance is achieved through redundancy that eliminates single points of failure
    Checked 2026-10-10.

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