I have 1 Drobo Pro connected with FireWire 800 to a Mac mini. When I measure the speed of that drive, I’m getting 55MB/s throughput. On the daisy-chained Drobo, I’m only getting 23MB/s throughput.
Is this a Drobo issue or an OS issue?
23 MB/sec from the Drobo sounds in-line with normal performance.
How do I get abnormal performance from it then? 
I really like the fast one…
Could be a FW bus issue.
So, it’s a Pro and Drobo daisy chained or 2 Pro’s chained?
Yeah, what Jennifer asked.
Also, remember that Firewire is a repeater-based technology, and the bus will “throttle down” to the fastest speed of the slowest component.
I’d check the speed of each Drobo individually, then check again daisy-chained.
2 x Drobo Pro. Customer is now 208 miles away, so I can’t test until I get some more Pro’s.