Here are some links to further reading that will help with getting a far deeper understanding of MetroCluster:
High Availability and MetroCluster Configuration Guide
MetroCluster Best Practices for Implementation
Configuring a stretch MetroCluster system with SAS disk shelves
Installing FC-to-SAS bridges and SAS disk shelves
A Continuous-Availability Solution for VMware vSphere and Netapp
MetroCluster Plug-in 1.0 for vSphere
MetroCluster Clustered On-Tap was not covered as part of this series but if you’re looking at CDOT MetroCluster the below documents may be useful:
OnTap 8.3
MetroCluster Management and Disaster Recovery Guide