Cluster Shared Volumes
Cluster Shared Volumes (CSV) was originally introduced in Windows Server 2008 R2, and at that time, it was used to simply share storage configurations for Hyper-V Failover Clustering. Effectively, CSV eliminated the need to use drive-letter identifiers on volumes and removed the need for one logical disk per virtual machine in the cluster.
From its original implementation in Windows NT, Failover Clustering has always used a shared nothing storage architecture. This means that each disk was owned by a single node within the cluster, and only that node could perform direct I/O to that specific disk. This model also meant that the smallest unit of failover for clustering was at the logical disk level, not at a volume level. ...
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