1menuconfig RAS 2 bool "Reliability, Availability and Serviceability (RAS) features" 3 help 4 Reliability, availability and serviceability (RAS) is a computer 5 hardware engineering term. Computers designed with higher levels 6 of RAS have a multitude of features that protect data integrity 7 and help them stay available for long periods of time without 8 failure. 9 10 Reliability can be defined as the probability that the system will 11 produce correct outputs up to some given time. Reliability is 12 enhanced by features that help to avoid, detect and repair hardware 13 faults. 14 15 Availability is the probability a system is operational at a given 16 time, i.e. the amount of time a device is actually operating as the 17 percentage of total time it should be operating. 18 19 Serviceability or maintainability is the simplicity and speed with 20 which a system can be repaired or maintained; if the time to repair 21 a failed system increases, then availability will decrease. 22 23 Note that Reliability and Availability are distinct concepts: 24 Reliability is a measure of the ability of a system to function 25 correctly, including avoiding data corruption, whereas Availability 26 measures how often it is available for use, even though it may not 27 be functioning correctly. For example, a server may run forever and 28 so have ideal availability, but may be unreliable, with frequent 29 data corruption. 30 31if RAS 32 33source arch/x86/ras/Kconfig 34 35endif 36