Date: Thu, 19 Jul 2001 01:23:48 -0700 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: "Irwan Hadi" <irwanhadi@phxby.com>, <freebsd-questions@FreeBSD.ORG> Subject: RE: Ground Station Message-ID: <002f01c1102c$22a92380$1401a8c0@tedm.placo.com> In-Reply-To: <20010719003012.A7876@phxby.com>
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There's a 6th sense that you have to develop that you need to have in order to cross the line from a server that has 98% reliability to one that has 99.99999999999% reliability. I've built several servers using both FreeBSD and Solaris that I've felt crossed that line, and that I would be willing to trust to breath for me during an operation, or something like that. But, I've built many more that I've always had that little flicker of mistrust about. Frankly, I belive that it would be quite possible to build a ground station running on an old Sun Sparc that would have more reliability than a ground station running FreeBSD on new hardware. The capability of creating a highly reliable server has less to do with the platform and OS used and more to do with the skill and experience of the builder, and how much testing they put it through. My advice if you want to build a highly reliable ground station is that it needs to be completed and online at least 6 months, preferably a year, before your satellite is launched. It also needs many hundreds hours of simulation and testing to prove it out. Perhaps you should concentrate on not only building a ground station but building a second server that's principle goal is to simulate the sattellite that the ground station is supposed to be controlling. Then plug them in to each other and program the fake satellite server to throw everything it's got to the ground station to try to blow it up. Ted Mittelstaedt tedm@toybox.placo.com Author of: The FreeBSD Corporate Networker's Guide Book website: http://www.freebsd-corp-net-guide.com >-----Original Message----- >From: owner-freebsd-questions@FreeBSD.ORG >[mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Irwan Hadi >Sent: Wednesday, July 18, 2001 11:30 PM >To: freebsd-questions@FreeBSD.ORG >Subject: Ground Station > > >Our university's electrical engineering department is designing a mini >satellite to be launched. For this satellite of course we need a ground >station to control the satellite. In the original blue plan, the >ground station is >designed to use a SUN Sparc Station with SunOS. But of course it is >very risky >to use an old Sparc Station to be the ground station of the satellite, since >if the terminal crash, we can say bye bye to the thousands of dollars >satellite. > >As right now, the ground station hasn't been built, is it possible if we use >FreeBSD in this project to be the ground station O/S ? because it has some >similarities with SunOS (the same UFS filesystem for example) ? How about the >reability of FreeBSD in the super critical environment like this as the O/S >mustn't crash or hang at all ? Does anyone has any suggestion in building the >ground station then (hardware, security, networking) ? > >Thank you in advance for your reply. I really appreciate that. > > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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