On Wed, Apr 09, 2014 at 09:46:54PM +0200, Borislav Petkov wrote:
>
> menuconfig RAS
> bool "Reliability, Availability, Serviceability features"
> help
> <A nice text about what this is going to contain, i.e. RAS stuff
>
How about this:
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 it 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.
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