I will be adding details on MetroCluster from a layman perspective. This page will contain the basic usage of a previously configured MetroCluster.
MetroCluster Upgrade Planning Guide
http://media.netapp.com/documents/tr-3517.pdf
Metrocluster Best Practice Guide TR
http://media.netapp.com/documents/tr-3548.pdf
I will add more details on this topic in time.