Comment by LtdJorge

Thanks for the long post. Sorry for the nerd snipe, it might or might not have been intentional :D

I agree with what you said. I'll test what you provided, first with fio and then with Postgres (was also my choice beforehand) with a TPC-E benchmark. If I remember, I'll let you know. Postgres on ZFS is specially difficult to be sure about just from theory around the internet, there's too much contradiction or outdated info.