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Bibliographic Item (1.0)
- Inhwan Lee & Ravishanka K Iyer
- Software Dependability in the Tandem GUARDIAN System
- IEEE Trans Software Engineering V21n5(May 1995)pp455-467
- =EXPERIENCE RISKS RELIABILITY QUALITY
Hardware fault tolerant design can also corect errors due to software
faults. Out of 200 Tandem Product Reports 153 were solved by fixing the
software and only 13% by hardware or operational failures. A single
software fault tends(72% of the time) to generate multiple problem reports
(time to develop fix+ time to stop system to instal fix + when the fix
itself fails (4/100)). Unexpected situations cause 29% of software faults,
missing operations 20%.
Critics standard reliabillity theory depending on number of remaining faults - one fault can be highly visible in the field.
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