Looking at the datasheet for the Cisco ACE GSS 4492R GSS device, under Global Traffic Management
" The Cisco GSS 4492R can be deployed as a standalone global traffic manager that globally load balances client requests across distributed data centers using network performance metrics such as content use, round-trip time (RTT) between client and the closest data center, routing topology, and any device performance values that are available through SNMP."
The part that interrests me is the RTT between client and closest data center. Looking at the config guide and other documentation I can see how make balancing decisions based on the client DNS server and find nothing based on actual client.
So the question - Is it possible to make balancing decisions based on round-trip time (RTT) between the actual client and the closest data center.