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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. [ 1 ] There is now more dependence on these systems as a result of modernization.
Availability is the probability that a system will work as required when required during the period of a mission. The mission could be the 18-hour span of an aircraft flight. The mission could be the 18-hour span of an aircraft flight.
Availability, achieved (Aa) [6] The probability that an item will operate satisfactorily at a given point in time when used under stated conditions in an ideal ...
Operational availability in systems engineering is a measurement of how long a system has been available to use when compared with how long it should have been available to be used. Definition [ edit ]
Availability is typically given as a percentage of the time a system is expected to be available, e.g., 99.999 percent ("five nines"). Serviceability or maintainability is the simplicity and speed with which a system can be repaired or maintained; if the time to repair a failed system increases, then availability will decrease.
As the chart above shows, it's normal for presidents to whiff on one Cabinet nominee at, or even before, the start of their presidency. Obama even had three: ...
High availability of services, when a service is available for 99.999% of the time, or around 5 minutes of downtime per year Nine (purity) , a 99.999% pure substance German 15 cm (5.9 in) artillery shells used in World War I
PERT network chart for a seven-month project with five milestones (10 through 50) and six activities (A through F). The program evaluation and review technique ( PERT ) is a statistical tool used in project management , which was designed to analyze and represent the tasks involved in completing a given project .