Powershell script to Live Migrate Hyper-V Virtual Machines back to it's Preferred Owner in a Hyper-V Cluster.

Stefan

August 21, 2011 20:50 CST

greate script!

i change the static cluster-name to a variable.
--------snip----------
## Get Cluster Name
$Cluster = Get-Cluster

...
#change Hyper-V => $Cluster
$colItems = Get-ClusterOwnerNode -Cluster $Cluster -Group $VMGroup
-------/snip---------

Tom Waarsenburg

June 12, 2012 22:03 CST

Thank You for the great script.
i've Modified the script for a 3 node cluster.:

------------------script snip-------------------------------------------

## Upon Startup of the Hyper-V Host, check to see if VMs have been Live Migrated to another Host.

## If the VM has this Host set as being the Preferred Owner, Live Migrate them back to this Node.

## Let me know if you have a better way of doing this as I am not a very good developer and new to Powershell.

## Credits: pdconsec.net/.../...rate-VMs-On-Host-Shutdown.aspx

ImportSystemModules

#clustername ophalen
[string]$cluster = Get-Cluster

#clusternodes ophalen
$ClusterNodes = Get-ClusterNode


foreach ( $clusternode in $clusternodes )

{
[string]$clusternode = $clusternode

  ## Get all the VMs in the Cluster on the Other Node
  $VMGroups = Get-ClusterNode $clusternode | Get-ClusterGroup | ?{ $_ | Get-ClusterResource | ?{ $_.ResourceType -like "Virtual Machine" } }
        foreach ( $VMGroup in $VMGroups )
        {
                                        write-host "*****************************"
          write-host "VM : $VMGroup"
          
          $O = 0
          ## Get the Preferred Owner of the VM
          $colItems = Get-ClusterOwnerNode -Cluster $cluster -Group $VMGroup
          
          [string]$strONodes = $colItems.OwnerNodes

          foreach ($ONode in $colItems.OwnerNodes)
          {              
                
          $O++
          $DoMigrate = ""
          }
            ## If there is more than one Preferred Owner, do not migrate
            if ($O -gt 1)
            {
              write-host
              write-host "$VMGroup has more than one Preferred Node: $strONodes"
              write-host
              write-host "$VMGroup will not be migrated..."
              write-host "If you want $VMGroup to have only one Preferred Node, uncheck all but the one Node"
              $DoMigrate = "No"
            }
            ## If there is only one Preferred owner, grab the Node Name
            elseif ($O -eq 1)
            {
            
            $DoMigrate = "Yes"
            [string]$pf = $colItems.OwnerNodes -Replace " ", ""
            
            }

          [string]$currentVM = $VMGroup
          
          $Currentowner = Get-ClusterGroup -name $currentVM
          
          $Currentowner = $Currentowner.ownernode
          
          [string]$strCurrentOwner = $Currentowner
          
          ## Check the Node Status
          $nodestate = (get-clusternode -Name $pf)
                
          $nodestate = $nodestate.State
                  
          [string]$strnodestate = $nodestate
          
          ## If the Current Owner is the Preferred, there is nothing to do.
          if ($strCurrentOwner -eq $pf)
          {
            write-host
            write-host "$VMGroup is on $Currentowner and will stay on $pf..."
            write-host
          }
          
          ## If the Current Owner is not the Preferred Owner, and the Preferred Owner is up, Live Migrate it back to the Preferred Owner.
          If ( $strCurrentOwner -ne $pf )
          {
            write-host "$VMGroup is on $Currentowner but should be on $pf..."
            write-host
            If ($strnodestate -eq "Up" -and $DoMigrate -eq "Yes")
            {
            write-host
            write-host "The Node $pf is Up"
            write-host
            write-host "Live Migrate $VMGroup to Node $pf"
            write-host
            Move-ClusterVirtualMachineRole $VMGroup -Node $pf
            write-host
            write-host "*****************************"
            }
          }
        
        }
  }


----------------------------------------end script snip ----------------------------------------------------------------------------------

luke

August 21, 2014 06:17 CST

Hi,

How easy would it be to amend this for a 4 node cluster? 2012r2?

Thanks,

Stan Czerno

August 28, 2014 08:41 CST

I have it running on a three node cluster without any issues. You'll just have to test it out and see since I do not have more than three currently.