Abstract
Abstract : This paper describes an analysis of hardware related software errors on the MVS operating system at the Center for Information Technology at Stanford University. The study first examines the software error detection mechanism with particular reference to the detection of software errors related to temporary and permanent hardware problems. About 11 percent of all software errors and over 40 percent of all software failures were found to be hardware related. It is shown that the system is seldom able to diagnose the fact that a software error may be hardware related. Key patterns in the occurrence of hardware related software errors are determined and their effect on system recovery examined. In a HW/SW record, both the hardware and the software errors occur in large clusters and have a significant percentage of lost records associated with them. The system recovery management is less likely to recover from hardware related software errors than software errors in general. It is suggested that the error patterns found in this study could form the basis for the detection and recovery management of hardware related software errors. (Author)
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