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I know this is what most of the SpaceX mission control systems do. They're set up with ~3x/5x redundancy for effectively consumer hardware. If they detect memor
by icyfox 3y ago
I know this is what most of the SpaceX mission control systems do. They're set up with ~3x/5x redundancy for effectively consumer hardware. If they detect memory misalignment between 1/3 of the nodes, they'll power cycle it while the other 2 take primary control. Big cost savings by not having to purchase radiation-hardened hardware and AFAIK they see similar reliability.
- readthenotes1 3y agoIirc, that's how the space shuttle control systems worked as well, but they were not COTS...
- dr_orpheus 3y agoYes, most of the manned missions (at least Apollo and beyond as far as I'm aware) use the belt and suspenders approach of triple voting rad-hardened processors. So 3x RAD750s in a voting redundancy for main control systems.
- mhandley 3y agoI believe the shuttles used five computers - four ran the same software and voted if there was a discrepency, whereas the fifth ran simpler independently developed software in case a common bug rendered all four primary computers inoperable.
- treyd 3y agoIIRC they have 3 pairs (6 total) and if any of the pairs have a mismatch they powercycle them both and let the other 4 continue as-is as you described.