Re:Meta quickly detects silent data corruptions at scale
by huhtenberg on Monday April 04, 2022 @04:52PM
(#30911801)
> That is simply not true.
It indeed is not. Had to reread the theory and I stand corrected, RS-style ECC can't detect errors in excess of the redundancy count.
> How is that not real bitrot?
It is and I can see how it can happen.
> How does it matter, beyond ruling out everything above the disk level, what the precise causes are?
It would've mattered if a drive could detect on-disk bitrot reliably, which was what the stats I worked with (also in exabytes, funnily enough) and the IEEE papers I read led me to believe.
It indeed is not. Had to reread the theory and I stand corrected, RS-style ECC can't detect errors in excess of the redundancy count.
> How is that not real bitrot?
It is and I can see how it can happen.
> How does it matter, beyond ruling out everything above the disk level, what the precise causes are?
It would've mattered if a drive could detect on-disk bitrot reliably, which was what the stats I worked with (also in exabytes, funnily enough) and the IEEE papers I read led me to believe.
For what it's worth, you won. Hats off.