OS support for fault tolerance
perryh at pluto.rain.com
perryh at pluto.rain.com
Tue Feb 21 07:13:18 UTC 2012
"Dieter BSD" <dieterbsd at engineer.com> wrote:
> The problem then is how to feed both machines the same inputs, and
> compare the outputs. ??Do we need a third machine to supervise?
> Can we have each machine keep an eye on the other, avoiding the
> need for a third machine?
A pair would work as long as the only failures are "obvious" (e.g.
crashes). If they simply disagree as to the result, how would we
determine which one was right?
> Which then leads to the issue of how to avoid problems when *it*
> breaks.
For some reason, this reminds me of a Dr. Seuss story:
http://www.goodreads.com/review/show/49519038
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