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The quest to provide IT (information technology) systems infrastructures that can support the required level of end-user service availability for an organization is ongoing and likely to be never ending. That said, real progress has been made as engineers and practitioners have increased their objectives from a focus on reliable systems, to multisystem configurations, to multisite deployments, so that today it is possible to provide service that is continuously available (i.e., available 99.999 percent of the time) to end users.
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