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Robustness vs Fault Tolerance

Verfasst: 18. Aug 2016 10:32
von Jakob
Hello,

I am not quite sure about the difference between robustness and fault tolerance.

While the goal of fault tolerance is clear (avoiding/mitigating failures in the presence of faults
& to providing sustained correct services), I did not find a definition for robustness in the slides.
-> What is robustness?

I wanted to ask, since these definitions seem quite important, since it was even asked for in the midterm-exam.

Thanks and regards,
Jakob

Re: Robustness vs Fault Tolerance

Verfasst: 18. Aug 2016 10:42
von Stefan Winter
Hi Jakob,

for terminology, I recommend http://ieeexplore.ieee.org/xpls/abs_all ... er=1335465.

In a nutshell, the difference is that fault tolerance refers to the continuation of correct operation in the presence of faults in general, whereas robustness refers to the continuation of correct operation in the presence of external faults (faults that originate from beyond the system boundary). Thus, fault tolerance implies robustness, but not vice versa.

Cheers,
Stefan

Re: Robustness vs Fault Tolerance

Verfasst: 21. Aug 2016 09:24
von Jakob
Thanks a lot, that cleared it up.