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- High_availability abstract "High availability is a characteristic of a system. The definition of availability is Ao = up time / total time.This equation is not practically useful, but if (total time - down time) is substituted for up time then you haveAo = (total time - down time) / total time.Determining tolerable down time is practical. From that, the required availability may be easilycalculated. High availability system design approach and associated service implementation that ensures a prearranged level of operational performance will be met during a contractual measurement period.There are three principles of high availability engineering. They are1. Elimination of single points of failure. This means adding redundancy to the system sothat failure of a component does not mean failure of the entire system.2. Reliable crossover. In multithreaded systems, the crossover point itself tends to becomea single point of failure. High availability engineering must provide for reliable crossover.3. Detection of failures as they occur. If the two principles above are observed, then a user may never see a failure. But the maintenance activity must. 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 users point of view - unavailable. Generally, the term downtime is used to refer to periods when a system is unavailable.".
- High_availability wikiPageExternalLink index_en.html.
- High_availability wikiPageExternalLink index.html.
- High_availability wikiPageExternalLink technologies_white_paper09186a00800a998b.shtml.
- High_availability wikiPageID "3824661".
- High_availability wikiPageRevisionID "606473346".
- High_availability hasPhotoCollection High_availability.
- High_availability subject Category:Applied_probability.
- High_availability subject Category:Measurement.
- High_availability subject Category:Quality_control.
- High_availability subject Category:Reliability_engineering.
- High_availability subject Category:System_administration.
- High_availability comment "High availability is a characteristic of a system. The definition of availability is Ao = up time / total time.This equation is not practically useful, but if (total time - down time) is substituted for up time then you haveAo = (total time - down time) / total time.Determining tolerable down time is practical. From that, the required availability may be easilycalculated.".
- High_availability label "Alta disponibilidad".
- High_availability label "Haute disponibilité".
- High_availability label "High availability".
- High_availability label "Hochverfügbarkeit".
- High_availability label "System wysokiej niezawodności".
- High_availability label "Высокая доступность".
- High_availability label "高可用性".
- High_availability sameAs Vysoká_dostupnost.
- High_availability sameAs Hochverfügbarkeit.
- High_availability sameAs Alta_disponibilidad.
- High_availability sameAs Haute_disponibilité.
- High_availability sameAs 高可用性.
- High_availability sameAs 고가용성.
- High_availability sameAs System_wysokiej_niezawodności.
- High_availability sameAs m.0b1x4h.
- High_availability sameAs Q1622420.
- High_availability sameAs Q1622420.
- High_availability wasDerivedFrom High_availability?oldid=606473346.
- High_availability isPrimaryTopicOf High_availability.