Benefits
This enables a virtual machine (VM) complete mobility throughout the cluster as any node can access the VHD files on the shared volume. Cluster Shared Volumes simplifies storage management by allowing large numbers of VMs to be accessed off a common shared disk. CSV also increases the resiliency of the cluster by having I/O fault detection and recovery over alternate communication paths between the nodes in the cluster.
While CSV is not required for Live Migration of VMs, it reduces the potential disconnection period at the end of the migration since the NTFS file system does not have to be unmounted/mounted as is the case with a traditional cluster disk. This helps ensure seamless live migration since the physical disk resource does not need to be moved between nodes. CSV increases the chance that a live migration will complete within the TCP reconnect window and ensure a seamless operation to clients.
Read more about this topic: Cluster Shared Volumes
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