[roland-s]

100% yes. With non-ECC you will always have bad RAM bits eventually. With ZFS this is especially bad because it can corrupt your checksums or your ZFS metadata, which means either silently corrupting your data, or corrupting ZFS itself and losing your entire zpool (akin to losing a RAID array).

[kurlberg]

Maybe not: that ZFS needs ECC is "common wisdom", but the disaster scenario appears not so likely. See

https://news.ycombinator.com/item?id=14207520

https://news.ycombinator.com/item?id=8293025

[denkmoon]

This is FUD perpetuated by a certain individual on the FreeNAS forum.