Reliability, availability and serviceability
Quality of robustness of computer hardware / From Wikipedia, the free encyclopedia
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Reliability, availability and serviceability (RAS), also known as reliability, availability, and maintainability (RAM), is a computer hardware engineering term involving reliability engineering, high availability, and serviceability design. The phrase was originally used by International Business Machines (IBM) as a term to describe the robustness of their mainframe computers.[1][2]
Computers designed with higher levels of RAS have many features that protect data integrity and help them stay available for long periods of time without failure[3] This data integrity and uptime is a particular selling point for mainframes and fault-tolerant systems.