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High availability - Wikipedia

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High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. Modernization has resulted in an increased reliance on these systems. For example, hospitals and data centers require high availability of their systems to perform routine daily activities. Availability refers to the ability of the user community to obtain a service or good, access the system, whether to submit new work, update or alter existing work, or collect the results of previous work. If a user cannot access the system, it is – from the user's point of view – unavailable.[1] Generally, the term downtime is used to refer to periods when a system is unavailable. High availability is a property of network resilience, the ability to "provide and maintain an acceptable level of service in the face of faults and challenges to normal operation."[2] Threats and challenges for services can range from simple misconfiguratio

High availability - Wikipedia High availability From Wikipedia, the free encyclopedia Jump to navigation Jump to search Systems with high up-time, a.k.a. "always on" "Always-on" redirects here. For the software restriction, see Always-on DRM . High availability ( HA ) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime , for a higher than normal period. [ 1 ] There is now more dependence on these systems as a result of modernization. For example, to carry out their regular daily tasks, hospitals and data centers need their systems to b

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