Detach-SCSILun.ps1

# PowerCLI Script for detaching luns from a cluster
# @davidstamen
# http://davidstamen.com

$LunIDs = "naa.6000000001","naa.600000002"
$Clustername = "MyCluster"

function Detach-Disk{
    param(
        [VMware.VimAutomation.ViCore.Impl.V1.Inventory.VMHostImpl]$VMHost,
        [string]$CanonicalName    )

    $storSys = Get-View $VMHost.Extensiondata.ConfigManager.StorageSystem
    $lunUuid = (Get-ScsiLun -VmHost $VMHost | where {$_.CanonicalName -eq $CanonicalName}).ExtensionData.Uuid

    $storSys.DetachScsiLun($lunUuid)
}

########################################################################################


$ClusterHosts = Get-Cluster $Clustername | Get-VMHost

Foreach($VMHost in $ClusterHosts)
{
    Foreach($LUNid in $LunIDs)
    {
        Write-Host "Detaching" $LUNid "from" $VMHost -ForegroundColor "Yellow"
        Detach-Disk -VMHost $VMHost -CanonicalName $LUNid
    }
}