Fault tolerance is the ability to continue satisfying a specified service property despite a stated class of component failures. The failure model and the property matter: preserving stored bytes, accepting new connections and finishing an operation are different requirements.
For an observation period of duration , let be the total time during which a service meets a specified condition. Its measured service availability is . The condition must say which operation can be performed: accepting a new user and serving an already admitted user can have different dependencies. A mandatory service dependency can reduce service availability even when all data copies remain intact.
A failure domain groups components that can be affected by a specified shared failure. The relevant grouping can follow physical infrastructure or an administrative dependency. Distinct sites do not establish independent behaviour when they still depend on the same component or decision. The grouping must therefore be stated relative to the failures under consideration, rather than inferred from distance alone.
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Fault tolerance refers to the ability of a system, particularly in computing and engineering, to continue operating properly in the event of the failure of some of its components. It involves designing systems in such a way that they can tolerate errors or failures without complete disruption of services or loss of data. Key aspects of fault tolerance include: 1. **Redundancy**: This involves duplicating critical components or functions of a system to provide backup options in case of failure. This can include hardware redundancy (e.