And I was talking about normal drives. Not the latest 7200 RPM large cache NAS drive. Even my WD Red Pros don't break 200. And he didn't specify what drives were being used, I used an average of about 150 which is what I would say is the average of every drive I own (I have a pile of over 30 drives...).
Either way, a raid z2 array has two parity drives. I wouldn't expect it to get more than than the speed of two drives which is still (even with your fast drives) WELL under 10GBe let alone 40 GBe. So, my point stands that storage is the performance bottleneck.
Totally agree that storage is his bottleneck. Nevertheless it depends on what particular drive he is using to make an evaluation of his transfer rates. Especially since he talks about maximum transfer rate. That's why I found it a bit surprising why you simply say that he can't expect more than 150 MB/s per disk anyway. You don't need to feel attacked at all. I only asked if you could explain the 150.