Failover is the capability to switch over automatically to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active server, system, or network. Failover happens without human intervention and generally without warning, unlike switchover. Redundancy, in general terms, refers to the quality or state of being redundant, that is: exceeding what is necessary or normal, containing an excess. ... In telecommunication, the term standby has the following meanings: In computer and communications systems operations, pertaining to a power-saving condition or status of operation of equipment that is ready for use but not in use. ... A computer is a device or machine for making calculations or controlling operations that are expressible in numerical or logical terms. ... In computing, a server is: A computer software application that carries out some task (i. ... A system is an assemblage of inter-related elements comprising a unified whole. ... It has been suggested that networking be merged into this article or section. ... An ABEND (or abnormal end or abend) is an abnormal termination of software, a Crash or lossage. ...

Systems designers usually provide failover capability in servers, systems or networks requiring continuous availability and a high degree of reliability. Categories: Move to Wiktionary | Computer stubs ... In telecommunications and Reliability theory, the term availability has the following meanings: 1. ... In engineering in general, reliability is the capacity of a component or a system of such components to perform as designed. ...

See also

• Safety engineering
• Redundancy
• Fault-tolerance