In this particular deployment we have two Cisco Nexus 5548's each with a 2k FEX attached to it. We have our DROBO units connected to the 2k FEX's as we did not want to use copper SFP's that could instead be used for 10gbps links. We have two ports from the DROBO connected to switch A, and a single port from the DROBO connected to switch B. I'm unable to show the counters for the host(s) at this time as they are running on multiple Cisco UCS domains and the counters are a bit skewed. If it is valuable to you, I can get you counters for the hosts from their fabric interconnects, but am unable to get in to obtain them at this time.
Switch A eth100/1/16-17
Switch B eth100/1/16