Availability is user-visible uptime. Fault tolerance is the design that keeps serving when parts fail.
Availability refers to the assurance that systems, services, and data are accessible and usable when needed by authorized users. It ensures that technology functions reliably and consistently throughout its intended operational lifespan. In practice, availability is achieved.
Availability ensures systems and data are accessible and usable when needed, maintaining operational continuity and user access.
Full PathTerms™ definitionFault tolerance is the ability of a system to continue operating without interruption or loss of data when one or more of its components fail. It is achieved through redundancy, where backup components are available to take over immediately if a primary component malfunctions..
Fault tolerance ensures systems keep running even when parts fail, using redundancy to prevent downtime and data loss.
Full PathTerms™ definitionPeople mix up Availability and Fault tolerance in exam questions and job posts. Knowing the difference helps you pick the right control, process, or architecture choice.
Availability is user-visible uptime. Fault tolerance is the design that keeps serving when parts fail.
