reliability, availability, serviceability

from The Free On-line Dictionary of Computing (8 July 2008)

Reliability, Availability, Serviceability

   <system, design, hardware, software> (RAS) Three key
   attributes of a computing system design.  See {reliability},
   {availability}, and {serviceability}.

   The term "RAS" is fairly common in the computing industry
   (particularly computers and storage) as computing becomes more
   fundamental.  For example, a vehicle may depend on dozens of
   computers, and the consequences of the failure can be
   significant (e.g., an ambulance's engine won't start).

   (2000-08-13)