Cutting over and decommissioning old servers
You are now ready to cut over production users to the new load-balanced environment. To do so, update the pool FQDN in the production DNS to point to the virtual IP address (VIP) of the new load balancer. We recommend that you cut over at the start of a maintenance window in order to provide ample time for any client DNS caches to expire. There may be a period of time when some users may sign in to the old server and some to the new server. If any issues arise as a result of moving to the load-balanced pool, simply revert to the production DNS pool entry. After the load-balanced system has been functioning under load in a stable manner, you can decommission and repurpose the old single Front End Server.