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high availability software
High Availability Software refers to the use of software to ensure that systems are running (available) most of the time. High Availability is a characteristic of a system and is defined as the percentage of time that the system is functioning. It can be formally defined as (1 – (down time/ total time))
*100%. Although the minimum required availability varies by task, systems typically attempt to achieve 99.999% (5-nines) availability. This characteristic is weaker than fault tolerance, which typically seeks to provide 100% availability, albeit with significant price and performance penalties.
High Availability Software is measured by its performance when a subsystem fails, its ability to resume service in a state close to the state of the system at the time of the original failure, and its ability to perform other service-affecting tasks (such as software upgrade or configuration changes) in a manner that eliminates or minimizes down time. All faults that affect availability – hardware, software, and configuration need to be addressed by High Availability Software to maximize availability.
==High Availability Software Features==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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