Re: Need a powercli script to increase Harddisk1 of VMs in a folder by 20GB, can someone give a script..

If the VMs have a supported OS, you can do something like this

$folderName="MyFolder"
$helperName="MyHelperVM"
$extraGB=20

$helperVM=Get-VM-Name$helperName
if($helperVM.PowerState-ne"PoweredOff"){
  "The HelperVM needs to be powered off !"
  return
}

Get-Folder-Name$folderName|Get-VM|%{
  if($_.PowerState-eq"PoweredOff"){
    $hd=Get-HardDisk-VM$_|where {$_.Name-eq"Hard disk 1"} |
    Set-HardDisk-HardDisk$hd-CapacityGB ($hd.CapacityGB+$extraGB) -HelperVM$helperVM-ResizeGuestPartition
  }
  else{
    "VM $($vm.Name) is not powerd off"
  }
}

It's possible that you need to provide credentials for the guest OS on the Set-Harddisk cmdlet