set-network adapter fails from script

[Trebormint]

I've got a script that imports some virtual machines and changes the NIC's network label as well. The command to change the network label is

Get-VM -name $vmName |Get-NetworkAdapter |Set-NetworkAdapter -NetworkName $NETLABEL -Confirm:$FALSE

Rather oddly this only works some of the time but doesn't error when it has failed. If I run the command manually it works fine all of the time.

The events for the imported server show the following:

1. Registered with VirtualCenter

2. Task: Reconfigure virtual machine

3. BIOS UUID being changed - this is because the server is a replica of any existing guest

4. MAC address being changed - ditto

5. Reconfigure virtual machine.

I'm wondering if the changing of the MAC and/or UUID is conflicting with the scripted NIC change.

Any ideas please?

Thanks

[LucD]

The cmdlets to change the network are correct, provided you are sure the $NETLABEL variable holds a valid networkname in all cases.

The change of the MAC address is finished before you launch the change network line ?

You could try listing the current network name before changing it. Just to make sure all is ok.

Something like this for example

$net = Get-VM <VM-name> | Get-NetworkAdapter
$net | select Name, NetworkName, MAC
$net | Set-NetworkAdapter -NetworkName $NETLABEL -Confirm:$false

[Trebormint]

I'm positive that $NETLABEL contains a valid network name as it works for the next guest in the list.

Comparing the events log with that of a guest that did work I see a difference. In the successfully changed guest I see the MAC address being changed twice. The first has the original network label and the second has the new network label. If I put a 5 second or so delay in the script it would work, albeit a little untidy.

[Trebormint]

I put a little loop that waits for the network label to be what is should be after the cmdlet is run and found it updated correctly on the second run.

Must be a timing issue somewhere.

[LucD]

You could also use the Wait-Task cmdlet.