vmware-powercli-vcenter-normalize-cluster-shares.ps1

$vms = Get-Cluster CLUSTER_NAME_YOU_WANT_TO_NORMALIZE | Get-VM

Write-Host "Old configuration:" 
$vms | Get-VMResourceConfiguration

foreach ($vm in $vms)
{
	#Normalize CPU shares
	# vSphere 5.5 defaults: 
	# High:		2000 shares per configured vCPU
	# Normal:	1000 shares per configured vCPU
	# Low:		 500 shares per configured vCPU
	$cpuShares = ($vm.NumCpu * 1000);
	
	#Normalize Memory shares
	# vSphere 5.5 defaults: 
	# High:		20 shares per megabyte of configured vRAM
	# Normal:	10 shares per megabyte of configured vRAM
	# Low:		 5 shares per megabyte of configured vRAM
	$memShares = ($vm.MemoryMB * 10);
	
	$vm | Get-VMResourceConfiguration | Set-VMResourceConfiguration -CpuSharesLevel Custom -NumCpuShares $cpuShares -MemSharesLevel Custom -NumMemShares $memShares
}

Write-Host "New configuration:" 
$vms | Get-VMResourceConfiguration

Will normalize any share configuration (CPU / Memory) within a cluster.