What is System Availability?

The term system availability, in a nutshell, describes a system operating correctly, reachable, and is available for use by consuming customer and systems.  Generally, speaking system availability is a measure used to ensure that a system and/or application is meeting it Service Level Agreement (SLA) obligations.  Any loss of service, whether planned or unplanned, is known as an outage. Downtime is the duration of an outage measured in units of time (e.g., minutes or hours).

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