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More simply, going from 99.9% availability to 99.95% availability is a factor of 2 (0.1% to 0.05% unavailability), but going from 99.95% to 99.99% availability is a factor of 5 (0.05% to 0.01% unavailability), over twice as much. [note 3] A formulation of the class of 9s based on a system's unavailability would be
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
Availability includes non-operational periods associated with reliability, maintenance, and logistics. This is measured in terms of nines. Five-9's (99.999%) means less than 5 minutes when the system is not operating correctly over the span of one year. Availability is only meaningful for supportable systems.
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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 ...
Availability of parallel components = 1 - (1 - X)^ N [3] Using parallel components can exponentially increase the availability of overall system. [2] For example if each of your hosts has only 50% availability, by using 10 of hosts in parallel, you can achieve 99.9023% availability. [3] Note that redundancy doesn’t always lead to higher ...
Illinois Bureau of Criminal Investigations; Capital Development Board; Illinois Civil Service Commission; Illinois Commerce Commission; Illinois Commission on Government Forecasting and Accountability; Illinois Commission on Volunteerism and Community Service; Illinois Community and Residential Services Authority; Illinois Community College Board
The Illinois Department of Human Services (IDHS) is the department [1] [2] of the Illinois state government responsible for providing a wide variety of safety net services to Illinois residents in poverty, who are facing other economic challenges, or who have any of a variety of disabilities. As of 2006, it was the largest administrative agency ...