In this video I give a basic break down of how to install and configure shared storage on Windows Server 2012 R2 and then use that storage with a Microsoft Failover Cluster with Multi-path I/O (MPIO) support and 100% validation in cluster manager.
Shared storage is often the biggest hurdle when getting into building your own clusters as it typically requires an expensive SAN or DAS, but in this case I am simply going to use a 3rd Windows Server to host the storage via iSCSI. For this lab I use 3 x Windows Servers, 2 as nodes in the cluster and 1 for the shared storage. A domain is also required for the Cluster but one is not required for the storage itself.