In addition to making it easy to provision/deploy servers and applications, the Web Farm Framework also includes load balancer integration. Specifically, the Web Farm Framework can integrate with an HTTP load balancer so that as web servers in the farm are updated with changes, they can be automatically pulled out of a load balancer rotation, updated, and then added back in.  The Web Farm Framework can also optionally update the machines one at a time – so that you always have servers available to handle heavily load.  This enables you to keep your site always available during updates – without you having to write any manual scripts to control or manage the update roll-out.

The current beta of the Web Farm Framework includes built-in support for the IIS Application Request Routing (ARR) service (which supports automatic load balancing of HTTP requests across multiple machines in a web-farm).  The Web Farm Framework makes it really easy to integrate your web farm of servers with ARR for load-balancing, and includes the support to automatically pull a server out of rotation as it is being updated, and then have it added back into rotation once the update is done.

The final Web Farm Framework release will enable extensibility with other load-balancing technologies as well – enabling the same ability to automatically pull/inject servers from a load balancing rotation as they are updated.