Hi there
Did you get anywhere with this problem? I have a similar configuration and have the exact same problem. I can also only add one datastore at a time, it is really weird. I can add all of the datastores but it will only see one at a time. Please let me know if you have had any joy, I logged a call with vmware but they will only contact me on Monday.
Thanks.
x3650 M5 , 2 x dual SAS HBA
v3700