1 # SPDX-License-Identifier: GPL-2.0-only
3 bool "Reliability, Availability and Serviceability (RAS) features"
5 Reliability, availability and serviceability (RAS) is a computer
6 hardware engineering term. Computers designed with higher levels
7 of RAS have a multitude of features that protect data integrity
8 and help them stay available for long periods of time without
11 Reliability can be defined as the probability that the system will
12 produce correct outputs up to some given time. Reliability is
13 enhanced by features that help to avoid, detect and repair hardware
16 Availability is the probability a system is operational at a given
17 time, i.e. the amount of time a device is actually operating as the
18 percentage of total time it should be operating.
20 Serviceability or maintainability is the simplicity and speed with
21 which a system can be repaired or maintained; if the time to repair
22 a failed system increases, then availability will decrease.
24 Note that Reliability and Availability are distinct concepts:
25 Reliability is a measure of the ability of a system to function
26 correctly, including avoiding data corruption, whereas Availability
27 measures how often it is available for use, even though it may not
28 be functioning correctly. For example, a server may run forever and
29 so have ideal availability, but may be unreliable, with frequent
34 source "arch/x86/ras/Kconfig"