Single Point of Failure, SPOF
Version 1.0.0 · Updated 2026-07-28
CORE DEFINITION
A single point of failure (SPOF) is a part of a system that, if it fails, will stop the entire system from working. In other words, a single point of failure is a major hidden danger that can cause overall failure. High-availability or high-reliability systems (business systems, software systems, or industrial systems) do not want a single point of failure to cause overall failure. Generally, redundancy can be used to add multiple components with the same function. As long as these components do not fail at the same time, the system (or at least part of the system) can still operate, which improves reliability, but also increases cost and some design difficulty.
SCAFFOLDING EFFECT
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A single point of failure (SPOF) is a part of a system that, if it fails, will stop the entire system from working. In other words, a single point of failure is a major hidden danger that can cause overall failure. High-availability or high-reliability systems (business systems, software systems, or industrial systems) do not want a single point of failure to cause overall failure.
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System reliability depends on the weakest link; when a component has no redundancy and is on the critical path, its failure leads to global failure, and the risk is proportional to its uniqueness.
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- zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E5%8D%95%E7%82%B9%E6%95%85%E9%9A%9Cverified
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