In Windows Server 2012 R2 Preview you can now view the state of a CSV on a per node basis. For example, you can see whether I/O is direct or redirected, or whether the CSV is unavailable. If a CSV is in I/O redirected mode, you can also view the reason.

Using the Get-ClusterSharedVolumeState Windows PowerShell cmdlet, you can quickly get state information about CSVs. In the following example, a specific LUN had only been assigned to one cluster node.

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For more information…

http://technet.microsoft.com/en-us/library/dn265972.aspx#BKMK_CSVDiagnose