is there some method to disable Block Ack feature in Aruba AP keeping 11n intact?
I got answer from Aruba community so updating the same here for future reference :
From Cmd line :
(ArubaController) #configure terminal wlan ht-ssid-profile {profile_name} (ArubaController)(High-throughput SSID profile "{profile_name}") #no mpdu-agg
From the GUI the change can be made from
Configuration > AP Group > Wireless Lan > VAP Profile > SSID > High-throughput SSID (advanced) > MPDU Aggregation unchecked.