Last week, I was looking for a way to retrieve the Clustered Shared Volume (CSV) to physical disk mapping on Windows Server 2012 using PowerShell. I have seen some scripts elsewhere that use DiskSignature to get this mapping using WMI. However, I wasn’t able to follow the same approach as the disk signature for some of the volumes I am using turned out to be 0x0 for some reason.

So, I started looking at an alternate approach and figured that I could use the volume path as the key. So, I started wrapping that code in a function and this is what I ended up with.

Function Get-CSVtoPhysicalDiskMapping {
param (
    [string]$clustername = "."
)
    $clusterSharedVolume = Get-ClusterSharedVolume -Cluster $clusterName
    foreach ($volume in $clusterSharedVolume) {
        $volumeowner = $volume.OwnerNode.Name
        $csvVolume = $volume.SharedVolumeInfo.Partition.Name
        $cimSession = New-CimSession -ComputerName $volumeowner
        $volumeInfo = Get-Disk -CimSession $cimSession | Get-Partition | Select DiskNumber, @{Name="Volume";Expression={Get-Volume -Partition $_ | Select -ExpandProperty ObjectId}}
        $csvdisknumber = ($volumeinfo | ? { $_.Volume -eq $csvVolume}).Disknumber
        $csvtophysicaldisk = New-Object -TypeName PSObject -Property @{
            "CSVName" = $volume.Name
            "CSVVolumePath" = $volume.SharedVolumeInfo.FriendlyVolumeName
            "CSVOwnerNode"= $volumeowner
            "CSVPhysicalDiskNumber" = $csvdisknumber
            "CSVPartitionNumber" = $volume.SharedVolumeInfo.PartitionNumber
        }
        $csvtophysicaldisk
    }
}

The code is self-explanatory. Since I am using the Windows Server 2012 storage cmdlets, this will work only on Windows Server 2012 systems and that is all I tested also.

Here is how you can use this function

Get-CSVtoPhysicalDiskMapping | ft -AutoSize
Get-CSVtoPhysicalDiskMapping -ClusterName MyCluster01 | ft -AutoSize

And, this is what you will see.

Hope this is helpful.