# Found 6/19/16  http://vmscribble.com/powercli/change-sdrs-vm-affinity-io-metric-space-threshold-by-cluster-script

# Add the PowerCLI snapin to PowerShell
Add-PSsnapin VMware.VimAutomation.Core -ErrorAction SilentlyContinue

#  thanks http://frankdenneman.nl/2012/02/21/impact-of-intra-vm-affinity-rules-on-storage-drs/

    function Set-DatastoreClusterDefaultIntraVmAffinity{
    param(
    [CmdletBinding()]
    [parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $true)]
    [PSObject]$DSC,
    [Switch]$Enabled
    )

    process{
    $SRMan = Get-View StorageResourceManager
    if($DSC.GetType().Name -eq "string"){
    $DSC = Get-DatastoreCluster -Name $DSC | Get-View
    }
    elseif($DSC.GetType().Name -eq "DatastoreClusterImpl"){
    $DSC = Get-DatastoreCluster -Name $DSC.Name | Get-View
    }
    $spec = New-Object VMware.Vim.StorageDrsConfigSpec
    $spec.podConfigSpec = New-Object VMware.Vim.StorageDrsPodConfigSpec
    $spec.podConfigSpec.DefaultIntraVmAffinity = $Enabled
    $SRMan.ConfigureStorageDrsForPod($DSC.MoRef, $spec, $true)
    }
    }

# Set Variables
$vCenter = Read-Host "Enter the FQDN of the vCenter"
$listofclusters = Read-Host "Enter the path to the list of storage clusters  ex. c:scriptsclusters.txt"
$clusName = Get-Content -path $listofclusters

# Connect to your vCenter
Connect-VIServer $vCenter

# Default VM affinity = un-checked
Get-DatastoreCluster $clusName | Set-DatastoreClusterDefaultIntraVmAffinity

# I/O metric inclusion = un-checked  / Space threshold = 75%
Get-DatastoreCluster $clusName| Set-DatastoreCluster -IOLoadBalanceEnabled $false | Set-DatastoreCluster -SpaceUtilization 75 -Confirm:$false

# Disconnect from the vCenter
Disconnect-VIServer $vCenter -Confirm:$false