ZFS Scrubs with no ECC (what could possibly go wrong?)

[etorix]

We’ve had ONE actual report of a Scrub of Death:

ECC memory vs Non-ECC memory - Poll!

I used to come down on the side of ECC being optional, but had a RAM stick fail in my parents server that would flip a certain bit so consistently that it not only caused scrubs to report errors, it actually caused ZFS to recalculate the parity data-- incorrectly-- and write it back to disk. This caused permanent corruption of dozens of files before I realized what was happening, even with a RAIDZ2. Luckily I had backups of most of it, and only ended up losing 1 file that had not been backed up…

Mythical, certainly. Blown out of proportion with its actual probablity, most likely.
But the probability is not zero.