FAULT INJECTION AND DEPENDABILITY EVALUATION OF FAULT-TOLERANT SYSTEMS

This paper describes a dependability evaluation method based on fault injection that establishes the link between the experimental evaluatio n of the fault tolerance process and the fault occurrence process. The main characteristics of a fault injection test sequence aimed at eval uating the coverage of the fault tolerance process are presented. Emph asis is given to the derivation of experimental measures. The various steps by which the fault occurrence and fault tolerance processes are combined to evaluate dependability measures are identified and their i nteractions are analyzed. The method is illustrated by an application to the dependability evaluation of the distributed fault-tolerant arch itecture of the ESPRIT Delta-4 Project.