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The legacy parts manufactured half a century ago have eight nines of uptime?
by jessriedel 9y ago
The legacy parts manufactured half a century ago have eight nines of uptime?
- AlgorithmicTime 9y agoOf course not, but you can't sue the manufacturer because they were made before that law was in place. Also the manufacturer is probably out of business by now.
- adrianN 9y agoRelays are pretty reliable if you exchange them regularly enough. Just because the stuff is old it doesn't mean that you can't build machines with enough redundancy to make them very dependable. It's not so clear that complex software solutions as in modern interlockings are more dependable than the comparably simple electromechanical solutions of yore. Cheaper, yes, more capable, sure, but more reliable?
- NikolaeVarius 9y agoNot just dependable in terms of systems engineering, these things were also massively "overdesigned" to be extremely reliable no matter what.
- jessriedel 9y ago> Just because the stuff is old it doesn't mean that you can't build machines with enough redundancy to make them very dependable. I can do the same with 1-dollar modern parts.
- adrianN 9y agoThat's exactly what the companies building these things do. It's not the material that's expensive, it's all the paperwork necessary to prove that it actually provides the guarantees that it does.
- jessriedel 9y agoThe context was you saying "they have to pay through the nose for replacement parts" and exabrial's downvoted reply, to which you replied "That LED light you can buy for a few bucks doesn't guarantee eight nines of uptime if you keep to the maintenance schedule". I don't know anything about this stuff, but your arguments have not been coherent.
- lmm 9y agoSolid-state electronics from 1967? Eight nines for individual components doesn't sound at all implausible to me.