GSLB powered zone preference is a feature that integrates XenApp/XenDesktop, StoreFront, and NetScaler to provide clients access to the most optimized data center on the basis of the client location.
In a distributed XenApp/XenDesktop deployment, StoreFront might not select an optimal datacenter when multiple equivalent resources are available from multiple datacenters. In such cases, StoreFront randomly selects a datacenter. It can send the request to any of the XenApp/XenDesktop servers in any datacenter, regardless of proximity to the client making the request.
With this enhancement, the client IP address is examined when an HTTP request arrives at the NetScaler Gateway appliance, and the real client IP address is used to create the datacenter preference list that is forwarded to StoreFront. If the NetScaler appliance is configured to insert the zone preference header, StoreFront 3.5 or later can use the information provided by the appliance to reorder the list of delivery controllers and connect to an optimal delivery controller in the same zone as the client. StoreFront selects the optimal gateway VPN virtual server for the selected datacenter zone, adds this information to the ICA file with appropriate IP addresses, and sends it to the client. Storefront then tries to launch applications hosted on the preferred datacenter's delivery controllers before trying to contact equivalent controllers in other datacenters.
For more information about configuring this solution, click here.
For a video overview about GSLB powered zone preference solution, click https://www.youtube.com/watch?v=Y8DELum0Xp0.