Date: Wed, 26 May 1999 01:46:36 +0200 From: Juergen Nickelsen <jnickelsen@acm.org> To: Graeme Tait <graeme@echidna.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: 100% dependability/failsafe/security/hardware Message-ID: <544719.3136671996@ockholm.jn.berlin.snafu.de> In-Reply-To: <374AC435.15C6C178@echidna.com>
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--On Die, 25. Mai 1999 11:39 -0400 Graeme Tait <graeme@echidna.com> wrote: > > > 3. How to provide 100% failsafe system? > > > > *All* hardware redundant: CPUs, RAM, secondary storage, data paths, > > power supplies, fans, UPSs, etc.; proactive hardware monitoring > > <snip of description of highly reliable $$$y$tem> > > I would say you need to start this project with an acceptable > downtime target. There is no such thing as perfection, and you can't > engineer an appropriate solution without quantifying your > requirements. Beyond a certain point, the reliability target becomes > the primary driver of design and cost. You are right, of course. I should have been more explicit about the point of my message, that real *100* % reliability is more than most people want to pay for, and more than most people need (given the cost). The goal should be, as you said, "acceptable downtime". Greetings, Juergen. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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