Date: Tue, 21 Feb 2012 06:05:09 -0800 From: perryh@pluto.rain.com To: dieterbsd@engineer.com Cc: freebsd-hackers@freebsd.org Subject: Re: OS support for fault tolerance Message-ID: <4f43a495.h%2BUSsCyXrPm0omOx%perryh@pluto.rain.com> In-Reply-To: <20120220185822.300970@gmx.com> References: <20120220185822.300970@gmx.com>
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"Dieter BSD" <dieterbsd@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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