Re: Doesn't everyone who works in storage know this?
"Significantly so; definitely worth optimizing for, especially with sequential I/O."
I'd disagree. It's a very small number of drives required to saturate the SAS connection, iSCSI/FC connection or even PCIE bus. Optimising for sequential IO by doing this doesn't buy enough difference unless you're really, really constrained by power, cooling and space. There is a lot of very sciencey sounding stuff about short stroking but a decent storage guy can easily design a better solution by other means.
What you're saying was true with ye olde large format drives, less so with 3.5" and almost irrelevant with 2.5" since the reduction in form factor has allowed number of drives to increase, power to decrease, and has meant there is considerably less difference between inner and outer tracks. Anyone who needs to write sequential that fast but has a requirement which has low enough capacity requirement to mean short stroking is viable should by now be using SSD arrays. Anyone needing the capacity to require large 3.5" drives can't afford to lose the space to short stroking.