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Dave West
On Mon, 24 Jan 2000, Jiri Baum wrote:
> I say again: do you have a solution you can offer for this problem?
>
> (The problem being persistence of data in the face of a UPS-destroying lightning bolt.)
>
> My personal take is that if you need more reliability than a UPS can
> provide, you should have some sort of multiple-controller setup anyway.
> Hardware of all kinds breaks down - even a relay can stick. Whether you
> then have the controllers wrestle for control, like they do on the Space
> Shuttle, or trust to some sort of electrical voting circuit, I leave up to you.
I sort of agree with this. I would be more extremist though and say that if you need more reliability than a UPS can provide then you need a direct line to God. As you say nothing in this world is 100% reliable.
> Jiri
>
> [*] for instance, you demand that a piece of software targeted at linux must run under *BSD.<
Linux is only supposed to be the development enviroment and the *initial* target so I don't think it is at all unreasonable to say it must run under BSD. It is probably less reasonable to say it must run under Windows but I don't think anyone will argue against running under Windows. A major debate may well ensue on the viability of such and how to do it, but I'm sure everyone agrees it will have to eventually.
Dave West E-Mail: [email protected]
Semiras Projects Ltd. PGP public key available on request.
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> I say again: do you have a solution you can offer for this problem?
>
> (The problem being persistence of data in the face of a UPS-destroying lightning bolt.)
>
> My personal take is that if you need more reliability than a UPS can
> provide, you should have some sort of multiple-controller setup anyway.
> Hardware of all kinds breaks down - even a relay can stick. Whether you
> then have the controllers wrestle for control, like they do on the Space
> Shuttle, or trust to some sort of electrical voting circuit, I leave up to you.
I sort of agree with this. I would be more extremist though and say that if you need more reliability than a UPS can provide then you need a direct line to God. As you say nothing in this world is 100% reliable.
> Jiri
>
> [*] for instance, you demand that a piece of software targeted at linux must run under *BSD.<
Linux is only supposed to be the development enviroment and the *initial* target so I don't think it is at all unreasonable to say it must run under BSD. It is probably less reasonable to say it must run under Windows but I don't think anyone will argue against running under Windows. A major debate may well ensue on the viability of such and how to do it, but I'm sure everyone agrees it will have to eventually.
Dave West E-Mail: [email protected]
Semiras Projects Ltd. PGP public key available on request.
_______________________________________________
LinuxPLC mailing list
[email protected]
http://linuxplc.org/mailman/listinfo/linuxplc