On Wed, Apr 16, 2014 at 02:33:01AM -0400, Chen, Gong wrote:
> 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:
Good. Just nitpicks below:
> 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
s/it/the system/. "it" is kinda misleading as to what we refer to.
> 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.
Nice!
> Note that reliability and availability are distinct concepts:
capitalized: ... that Reliability and Availability are ...
> Reliability is a measure of the ability of a system to function
> correctly, including avoiding data corruption, whereas availability
ditto: 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.
Very good description! :-)
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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