What was the layout of the ZFS pools? I've been using RAIDZ1 and RAIDZ2 for years now on ubuntu, and luckily have not detected any errors on my monthly scrubs. I did have bitrot on older drives previously when I just relied on EXT4, only to find out when trying to access an old file.

I'm using a Supermicro board, with ECC RAM, but anywhere from 4 to 6 drives in the pool (upgraded over 6 or 7 years now).