MENTAL MODEL · M9068

Fault-Tolerant System

SystemsHigh supportSystems Theory

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Updated 2026-08-15

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INTRODUCTION

English translation pending.

CORE DEFINITION

Fault tolerance designs a system so that a failure in one component degrades performance rather than causing collapse, using redundancy, error detection and isolation, graceful degradation, and defined recovery rules. It accepts that failures will occur and invests in containing them instead of preventing every one. The qualification is that redundancy adds cost and complexity, and that tolerance can mask an underlying cause if failures are absorbed without diagnosis.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Use Failure Containment: define how each failure is isolated before it can spread to the whole. - Use Degradation Planning: decide in advance which functions are shed first when capacity drops.

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Anchor fast decisions

Any single component has a nonzero failure rate, so prevention alone leaves the whole system exposed to the weakest part. Adding independent paths and detection means a failure removes capability rather than availability, and the system continues at reduced capacity while the fault is handled.

MINIMUM ACTION

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Practice this model in one real situation:

Identify the points where failure is most likely to occur. 2. Add redundancy and backup paths at those points. 3. Install detection and isolation so faults cannot spread. 4. Define the recovery rules for each failure mode. 5. Test the tolerances and monitor the tolerated failure rate.

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en.wikipedia.orghttps://en.wikipedia.org/wiki/Fault_toleranceZH · Explicit
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