New to Freenas and i need advices

[jgreco]

Yeah, that's definitely the flip side of the coin... it's really the *detection* that's ultimately important. Your bank probably doesn't want the fifty bucks in your checking account to turn into some randomly large number due to a stray cosmic ray running through an in-core portion of their database.

 

[Tréteau]

Double bit failures are generally a sign of a failed module. There is a lot of added complexity in trying to go beyond single bit error correction, which would mean extra memory and other stuff. The main focus of ECC is to remediate the occasional inadvertent bit flip that happens as a result of a cosmic ray, not on trying to force a failed module to appear "operational."

So a single-bit correction is enough? What would happen to a pool in case of hard failure of a memory module?

And the system will panic and/or the CPU will be halted on an uncorrectable error, so data corruption is fairly unlikely in that scenario.

That's the problem with Ryzen according to this article, it doesn't halt the system in case of two-bits errors.