I recently needed to check the path selection policy on a large number of Luns on a large number of hosts. The idea of doing it in the web client was worse than the 35 degrees outside so I decided to script it.

I started with the Get-ScsiLun cmdlet but it was slow as hell to run so I dug into extensiondata of the host object and came up with the script below. It runs a lot faster, you just specify one or several VMHost object(s) as parameter. It also supports the pipeline.

PS> Get-VMHost | Get-LunInformation

Function Get-LunInformation {



foreach ($VH in $VMHost) {

    foreach ($LUNMP in $VH.ExtensionData.config.StorageDevice.MultipathInfo.lun) {

        $LUN = $VH.ExtensionData.config.StorageDevice.ScsiLun | where uuid -eq $LUNMP.Id

        $PathNotActive = $LUNMP.path | where state -ne "Active" | Measure-Object | select -ExpandProperty count

        $LUNID = $LUNMP.Path.name | ForEach-Object {$_.split("L") | select -last 1} | select -Unique

            Host = $VH.name
            NAA = $LUN.canonicalname
            OperationalState = $LUN.OperationalState
            CapacityGB = [math]::round($LUN.capacity.BlockSize * $LUN.capacity.Block / 1GB,1)
            MultipathingPolicy = $LUNMP.Policy.policy
            SATP = $LUNMP.StorageArrayTypePolicy.Policy
            Description = "$($LUN.Vendor) $($Lun.Model)"
            NonActivePaths = $PathNotActive
            Type = $LUN.DeviceType
            Local = $LUN.LocalDisk
            LunID = [int]$LUNID


} # Foreach VMHost

} # Process