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availability
In IT and systems engineering, the degree to which a system or service is operational and accessible when needed. One of the key metrics for measuring system reliability.
可用性 is a technical IT term referring to system uptime and accessibility.
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Technical note
Availability is often expressed as a percentage (e.g., 99.9% = "three nines"). The term is part of the IT triad of 機密性 (confidentiality), 完全性 (integrity), and 可用性 (availability), known as CIA.