5 ms·
That is why it is important after building/tweaking a system to do stability tests. If it runs full out without errors for 24h then you are fine.
by grndzro 10y ago
That is why it is important after building/tweaking a system to do stability tests. If it runs full out without errors for 24h then you are fine.
- deaddodo 10y agoThat's.....not how non-ECC works. Even a little. RAM bitflips randomly, period. It's just how it works. A cosmic ray can hit the memory chip just right and flip it, there's no way to predict or control that no matter how "stable" your machine is. ECC still does the same, it just has a parity bit on each line to confirm against and flip it back, as needed.
- justincormack 10y agoIt is how faulty RAM works, and it is sensible to do that.
- Rebelgecko 10y agoNot just faulty RAM. As far as I know, all modern RAM is going to have bitflips every once in a while (it even happens with ECC RAM)
- deaddodo 10y agoI urge you to educate yourself. All RAM works this way, it's the very reason ECC RAM exists and the exact issue it solves.
- lisivka 10y agoI have no idea, why you downvoted. Stability test is important step of cluster building. If probability of something broken in new server is 10% then probability of something broken in new cluster of 10 servers is 1-(1-0.1)^10 = 65% .
- masklinn 10y agoBecause they objection has nothing to do with the original comment. Bitflips are not a RAM stability issue.
- lisivka 10y agoBitflips are not a RAM stability issue, they happen randomly due to radiation, but radiation is not random, especially in my area (I live not far from Chornobyl).
- masklinn 10y agoSure, but you won't solve excessive ambient radiation by running a stress test on your RAM.
- lisivka 10y agoA small radioactive («hot») dust particle will not change average radiation level a lot, but may cause problems with memory/cpu. Simple cleaning, by blowing dust out, fixes it. Saw that dozen of times, but years ago.
- EdHominem 10y agoDid you use a geiger counter to verify the dust was hot? Would something large enough to cause problems with the ram be large enough to detect?
- flamedoge 10y agoer.. you should probably move. Bitflips aren't the only things radiation does. Bitflips in DNA for example.
- lisivka 10y agoToo late, radiation is returned back to almost natural level (about 30% higher than natural). I have detector of radiation, so I can measure it myself. Sometimes wind can bring some radioactive dust from Chornobyl, e.g. after forest fire, but it is much less dangerous.