I just got my 5n2 and have some issues.
#1 I updated firmware on both units and moved my 5n drives over. 5n2 works but says it is in rebuild mode with 49 hours to go. Data is accessible but I did not expect rebuild mode. I installed the drives in the same order and everything.
#2 I have enabled bonding on the 5n2 and it shows the same IP address for both poets but on my netgear router r8500 it says link aggregation is inactive. I am using the correct 2 ports on the router and have aggregation enabled. Does the drobo not use the same protocol? The bonding was the reason I upgraded so my feelings are very mixed right now.