How to keep or ignore the UUID when you power on a virtual machine

We have a scenario where we are mirror of VMs from one site to another site for BCP which has a separate instance of the VC.

We pre-record the virtual computers hosted NFS in virtual center.

When we need to recover break us the mirror and power on the machine.

VC then promp with the question, you want to keep or throw the UUID.

How can be script as its easy to answer a few virtual machines but a pain for possibly up to a hundred?

There are a few things to keep in mind when you want to start the guests and answer the question in this way.

(1) the Start-VM cmdlet will wait for the prompt to start, but there is a question waiting it will never happen.

==> the solution is to use the Start-VM cmdlet with the parameter -RunAsync , this way the cmdlet will not wait.

(2) when a client starts, it will take some time before the issue appears.

==> the solution is to wait until the question is displayed with a loop

(3) to get the current status of the prompt, the script needs to get the VirtualMachine object with each pass through the loop.

The properties of the $vm variable are not automatically updated unless the script retrieves the object with the cmdlet Get-View.

(4) the purpose of the Question is present when the question is displayed. Prior to this point, this object is $null.

==> to avoid execution of the StartsWith method on a $null object if statement first checks to see if the object in Question is present.

The script relies on the fact that the two conditions that are combined with - and the operator are executed from left to right.

This is probably not a good programming practice and should be solved by using two nested If statements.

The following script implements all the points made above.

Note that it can only be used for the issue of msg.uuid.moved.

The script responses with choice 2 which is the choice of 'keep '.

$qMsgUuidMoved = "msg.uuid.moved:"
$choiceKeep = 2

$vmImpl = Get-VM "TestPC"
$vmImpl | Start-VM -RunAsync

do{
  $vm = $vmImpl | Get-View
  if($vm.Runtime.Question -ne $null -and $vm.Runtime.Question.Text.StartsWith($qMsgUuidMoved)){
    $vm.AnswerVM($vm.Runtime.Question.Id, $choiceKeep)
  }
} until ($vm.Runtime.PowerState -ne "poweredoff")

Write-Host $vm.Name "started"

Tags: VMware

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