Global Network Acceleration

Hi,

 

Is this scenario possible. I have 1 ltm in site A and second ltm in site B , I have a pool with 2 servers in site A and In site B. If 2 servers in pool are down in site A but ltm is up, can I serve the traffic from virtual pool servers in site B.

 

I have bee reading about iSessions but I am not sure if I need to do anything else besides iSessions.

 

Thanks.