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12/20 OT: RAS

Reliability, availability and serviceability (computer hardware) From Wikipedia, the free encyclopedia

Reliability, availability, and serviceability (RAS) is a computer hardware engineering term. The phrase was originally used by IBM as a term to describe the robustness of theirmainframe computers.[1][2] The concept is often known by the acronym RAS.

Computers designed with higher levels of RAS have a multitude of 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.

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  • Reliability can be defined as the probability that it will produce correct outputs up to some given time t.[4] Reliability is enhanced by features that help to avoid, detect and repair hardware faults. A reliable system does not silently continue and deliver results that include uncorrected corrupted data. Instead, it detects and, if possible, corrects the corruption, e.g., by retrying an operation for transient (soft) or intermittent errors, or else, for uncorrectable errors, isolating the fault and reporting it to higher level recovery mechanisms (which mayfailover to redundant replacement hardware, etc.), or else by halting the affected program or the entire system and reporting the corruption. Reliability is often characterized in terms ofmean time between failures (MTBF), with reliability = exp(-t/MTBF).[4]


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