| # SPDX-License-Identifier: GPL-2.0-only | |
| menuconfig RAS | |
| bool "Reliability, Availability and Serviceability (RAS) features" | |
| help | |
| 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. | |
| if RAS | |
| source "arch/x86/ras/Kconfig" | |
| endif |