If all the connections are being proxied through the same LTM pair, it doesn't really matter if the servers are close to the clients. You'd just want to use the pool of servers closest to LTM. Now, if you're able to have the clients connect directly to the servers (or an LTM in the regional datacenter), then you'd want to use the servers closest to the client. If the clients can connect directly to the servers, you could use your logic or do a GeoIP lookup using the whereis command and redirect the clients to an IP address or hostname which points to the closest regional servers.
Aaron
Nimbostratus
