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Definition updated on July 2023


High Availability Systems

What are high availability systems?

High availability (HA) is a system's ability to run continuously and error-free for a specific period. The goal of HA is to ensure that a system meets a predetermined benchmark for operational efficiency. Five-nine availability in information technology (IT) refers to a generally accepted yet challenging criterion of availability, which states that the system or product is available 99.999% of the time. Before being employed, highly available systems need to be carefully planned and evaluated. All of the components must meet the specified availability level before one of these systems may be planned. The capacity to backup and failover data is crucial for HA systems to achieve their availability objectives.

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