I wanted to bring this up as a separate topic since is something that affects a lot of people and it degrades the Drobo FS performance quite a bit.
The new Core i7 and Core i5 iMacs and the new Macbook Pros use the BCM5764 network chip which is unable to support jumbo frames. So while the Drobo FS delivers a very good performance with jumbo frames many Apple users can’t take advantage of this.
You can join the discussion at the Apple forums. Would be nice to have some comment from Data Robotics too.