I got the question from a colleague if i could add a parameter in my function, no problem, just some dividing..

So you can either set percent CPU/Memory or number of hosts and from that get a percent on the policy. I have not taken care of the case if you have more than 100 hosts in your cluster (as this is not possible, at least not yet 😉 )

function Set-HAAdmissionControlPolicy{
<#
.SYNOPSIS
Set the Percentage HA Admission Control Policy
 
.DESCRIPTION
Percentage of cluster resources reserved as failover spare capacity
 
.PARAMETER  Cluster
The Cluster object that is going to be configurered 

.PARAMETER numberHosts
When this parameter is set the percentage is set based on number of hosts in cluster
 
.PARAMETER percentCPU
The percent reservation of CPU Cluster resources
 
.PARAMETER percentMem
The percent reservation of Memory Cluster resources
 
.EXAMPLE
PS C:\> Set-HAAdmissionControlPolicy -Cluster $CL -percentCPU 50 -percentMem 50
 
.EXAMPLE
PS C:\> Get-Cluster | Set-HAAdmissionControlPolicy -percentCPU 50 -percentMem 50

.EXAMPLE
PS C:\> Set-HAAdmissionControlPolicy -Cluster $CL -numberHosts 5
 
.NOTES
Author: Niklas Akerlund / RTS
Date: 2012-01-25
#>
   param (
   [Parameter(Position=0,Mandatory=$true,HelpMessage="This need to be a clusterobject",
    ValueFromPipeline=$True)]
    $Cluster,
	[int]$numberHosts = 0,
    [int]$percentCPU = 25,
    [int]$percentMem = 25
    )
 
    if(Get-Cluster $Cluster){
 
        $spec = New-Object VMware.Vim.ClusterConfigSpecEx
        $spec.dasConfig = New-Object VMware.Vim.ClusterDasConfigInfo
        $spec.dasConfig.admissionControlPolicy = New-Object VMware.Vim.ClusterFailoverResourcesAdmissionControlPolicy
		if($numberHosts -eq 0){
        	$spec.dasConfig.admissionControlPolicy.cpuFailoverResourcesPercent = $percentCPU
        	$spec.dasConfig.admissionControlPolicy.memoryFailoverResourcesPercent = $percentMem
 		}else{
			$spec.dasConfig.admissionControlPolicy.cpuFailoverResourcesPercent = 100/$numberHosts
        	$spec.dasConfig.admissionControlPolicy.memoryFailoverResourcesPercent = 100/$numberHosts
		}
        $Cluster = Get-View $Cluster
        $Cluster.ReconfigureComputeResource_Task($spec, $true)
    }
}

Today i added some fields in my little reportscript for the VM and their NICs, the reason was because of a customer that had an issue with duplicate MAC´s on their network.

We had earlier this year moved some VMs from an old vCenter to a new, i have made a blog post about the migration and the script we ran there.

Now when they started to deploy new VMs on the old vCenter it gave out the same MAC addresses as the ones on the VM´s that we had moved.. not so good, there is a fix that can be implemented on the old vCenter so it will start using new MAC´s instead, if you have this issue you can read the following KB 1024025 and set a new ID on the old vCenter and restart the service 🙂

But to check the VMs on both vCenter servers i ran the following script to get the data, the customer wanted both the VM name and the hostname/fqdn from the vm, also for every nic if it was generated or assigned.

# Get the Virtual Network Adapter
# 
# Niklas Akerlund / RTS

$VMs = Get-VM *
$Data = @()

foreach ($VM in $VMs){
 	$VMGuest = Get-View $VM.Id	
	$NICs = $VM.NetworkAdapters
	foreach ($NIC in $NICs) {
		$into = New-Object PSObject
		Add-Member -InputObject $into -MemberType NoteProperty -Name VMname $VM.Name
		Add-Member -InputObject $into -MemberType NoteProperty -Name VMfqdn $VM.Guest.HostName
		Add-Member -InputObject $into -MemberType NoteProperty -Name NICtype $NIC.Type
		Add-Member -InputObject $into -MemberType NoteProperty -Name MacAddress $NIC.MacAddress
		Add-Member -InputObject $into -MemberType NoteProperty -Name AddresType $NIC.ExtensionData.AddressType
		$Data += $into
		
	}

}
$Data | Export-Csv -Path c:\powercli\VMNICinfo.csv -NoTypeInformation

Matt Boren that has the site vnugglets.com helped me with an more efficient way of getting the data, my script took about 5-10 minutes and Matt´s took 30 seconds, his key to lower time is using the Get-View for everything (i was only using it to get the vm.guest.hostname)

&{Get-View -ViewType VirtualMachine -Property Name, Guest.HostName, Config.Hardware.Device | %{
    $viewThisVM = $_
    $viewThisVM.Config.Hardware.Device | ?{$_ -is [VMware.Vim.VirtualEthernetCard]} | %{
        New-Object -Type PSObject -Property @{
            VMname = $viewThisVM.Name
            VMfqdn = $viewThisVM.Guest.HostName
            NICtype = $_.GetType().Name
            MacAddress = $_.MacAddress
            AddressType = $_.AddressType
        } ## end new-object
    } ## end foreach-object
} ## end foreach-object
} | Select VMname,VMfqdn,NICtype,MacAddress,AddressType | Export-Csv -Path C:\VMNICinfo2.csv -NoTypeInformation -UseCulture

And the result when imported into excel looks something like this:

Hi

I was informed that my script in the last post was not enough because @pfuhli has a bit more complex environment and then the Move-VM cmdlet is not sufficient because it moves the whole vm to the new datastore, no matter if the vmdk´s where located on different before.

As in some cases you have an virtual platform with different datastores for different performance levels and one VM has it´s vmdk configured to get the best throughput. So i  did this with help from a script that Luc Dekens did in a communities post, mine added some functionality as his only moved the config file.

please comment if you find something crazy, I have now started to get the hang of why I would use functions :-), yes i should add some error-checking, that will be in version 0.3

Probably it would take some time to get through 500 VM´s but instead of manual work it is worth it.

# Move VMs with sVMotion where vmdk is on different datastores and
# lastly move the config file to the same datastore as hard disk 1
#
# Niklas Åkerlund / RTS 20111127
# Part of code from Luc Dekens http://communities.vmware.com/message/1680735

# Here i extended Luc´s function for moving only config
function Move-VMs{
    param($vm)
	Write-Host $vm
    $HDDs = Get-HardDisk -VM $vm    
	# a foreach loop to move vmdk
	$HDDs | %{
		# Get the datastore name of the old
		$oldDS = $_.Filename.Split(']')[0].TrimStart('[')
		# as @pfuhli said the new lun has a preceding letter that differs from the old.
		$newDS = "N" + $oldDS 
		# Here i check which is the first hdd to later move the config there
		if ($_.Name -eq "Hard disk 1"){
			$dsNameHDD1 = $newDS
		}
		$newDS = Get-Datastore $newDS
		Set-HardDisk -HardDisk $_ -Datastore $newDS -Confirm:$false
	}
	
	# This part is for moving the config file
	$HDDs = Get-HardDisk -VM $vm
	$spec = New-Object VMware.Vim.VirtualMachineRelocateSpec 
	$spec.datastore = (Get-Datastore -Name $dsNameHDD1).Extensiondata.MoRef
    $HDDs | %{
        $disk = New-Object VMware.Vim.VirtualMachineRelocateSpecDiskLocator
        $disk.diskId = $_.Extensiondata.Key
        $disk.datastore = $_.Extensiondata.Backing.Datastore
        $spec.disk += $disk
    }
    $vm.Extensiondata.RelocateVM_Task($spec, "defaultPriority")
}

Get-VM | %{ 
	Move-VMs $_ 
}

Before running it on all VM´s i would test it on a few and then when feeling comfortable, you can move all 😀