I just ran into this interesting video by Sun's Brendan Gregg which shows how a sufficiently high noise produced in front of a disk rack can cause an observable spike in disk latency. It may seem a geeky thing, or maybe it's just the dinosaur in me which sweetly remembers the good ol' days when you even had to park disk heads in the landing zones if you wanted to move it safely. Nowadays I confess that I still have certain respect when working at my workstations and never, ever, produce much vibrations on the table where they're laying.
Interesting. Something to hold in due consideration.