Reliability, Availability and Serviceability Within IPL Functions of a Duplex Control System
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
The article describes Reliability, Availability and Serviceability (RA features within Initial Program Load (IPL) functions of a duplex control system which consists of two stored program controllers sharing two diskette units via an I/O bus. The IPL process is structured into steps regarding diskette activity, and the availability of one diskette unit is sufficient to put the system into operation. Diskette unit verification procedure, the capability of loading a diskette diagnostic program in case of diskette unit failure, and a trouble-shooting facility in case of double diskette unit or bus failures are provided.