This benchmark have three pool configurations: Single drive, a 2-way mirror, and a 3-way mirror. Please see the previous posts on testing methology and hardware specifications, if you haven’t already.
I expect the single drive to have the best write performance, followed by the 2-way then 3-way mirror. I also expect the mirrors to have better read performance, as there’s more drives to read from. I also expect there to be a noticeable performance penalty for record sizes smaller than ZFS’s configured recordsize of 128k. I expect error margins of +/- 10%. The random reads/writes should get almost linearly better performance with the larger record sizes.