| # 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 |
