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CONFIG_RAS: Reliability, Availability and Serviceability (RAS) features

General informations

The Linux kernel configuration item CONFIG_RAS has multiple definitions:

found in drivers/ras/Kconfig

The configuration item CONFIG_RAS:

Help text

(none)

Reliability, Availability and Serviceability (RAS) features found in drivers/ras/Kconfig

The configuration item CONFIG_RAS:

Help text

Reliability, availability and serviceability (RAS) is a computer hardware engineering term. 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.

Reliability can be defined as the probability that the system will produce correct outputs up to some given time. Reliability is enhanced by features that help to avoid, detect and repair hardware faults.

Availability is the probability a system is operational at a given time, i.e. the amount of time a device is actually operating as the percentage of total time it should be operating.

Serviceability or maintainability is the simplicity and speed with which a system can be repaired or maintained; if the time to repair a failed system increases, then availability will decrease.

Note that Reliability and Availability are distinct concepts: Reliability is a measure of the ability of a system to function correctly, including avoiding data corruption, whereas Availability measures how often it is available for use, even though it may not be functioning correctly. For example, a server may run forever and so have ideal availability, but may be unreliable, with frequent data corruption.

Hardware

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