Date: Tue, 14 Feb 2012 15:01:45 -0800 From: Julian Elischer <julian@freebsd.org> To: Rayson Ho <raysonlogin@gmail.com> Cc: Maninya M <maninya@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: OS support for fault tolerance Message-ID: <4F3AE7D9.8020204@freebsd.org> In-Reply-To: <CAHwLALOe1Zq86_AdO=D9pEEmOi_kT%2BrORMTXR-xEvhLX0Pt5gw@mail.gmail.com> References: <CAC46K3mc=V=oBOQnvEp9iMTyNXKD1Ki_%2BD0Akm8PM7rdJwDF8g@mail.gmail.com> <4F3A9266.9050905@freebsd.org> <CAHwLALOe1Zq86_AdO=D9pEEmOi_kT%2BrORMTXR-xEvhLX0Pt5gw@mail.gmail.com>
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On 2/14/12 9:27 AM, Rayson Ho wrote: > On Tue, Feb 14, 2012 at 11:57 AM, Julian Elischer<julian@freebsd.org> wrote: >> but I'm interested in any answers people may have > The way other OSes handle this is by detecting any abnormal amounts of > faults (sometimes it's not the fault of the hardware - eg. when a > partical from the outerspace hits a core and flips the bit), then the > disable the core(s). > > Solaris& mainframe (z/OS) handle it this way, but you should google > and find more info since I don't remember all the details. > > Also, see this presentation: "Getting to know the Solaris Fault > Management Architecture (FMA)": > http://www.prefetch.net/presentations/SolarisFaultManagement_Presentation.pdf True, but you can't guarantee that a cpu is going to fail in a way that you can detect like that. what if the clock just stops.. I believe that even those systems that support cpu deactivation on error only catch some percentage of the problems, and that sometimes it was more of "bring up the system without cpu X after it all crashed in flames". tandem and other systems in the old day s used to be able to cope with dying cpus pretty well but they had support from to to bottom and the software was written with 'clustering' in mind. > Rayson > > ================================= > Open Grid Scheduler / Grid Engine > http://gridscheduler.sourceforge.net/ > > Scalable Grid Engine Support Program > http://www.scalablelogic.com/ > >> >>> _______________________________________________ >>> freebsd-hackers@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >>> To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >>> >> _______________________________________________ >> freebsd-hackers@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > >
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