The cloud gives you room to grow. Before growth surprises you, you can establish some policies for handling it, using Auto Scale to add new cloud servers when they're needed. Autoscaling policies are easy to change as you become more familiar with the peaks and patterns in your workload.
Auto Scale relies on Cloud Monitoring and Cloud Load Balancers. To learn how to use Auto Scale through the Cloud Control Panel or the Cloud Monitoring API, start at the Rackspace Auto Scale introduction page.