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Knowledge Base

VM BIOS UUID is not reflected in WMIC of instant clone's guest OS when provisioning scheme used is Mode A (76916)

Last Updated: 7/13/2022Categories: InformationalTotal Views: 5404Language:
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Details

VM BIOS UUID is not reflected in WMIC of instant clone's guest OS when provisioning scheme used is Mode A.  Horizon uses Mode A for instant clone provisioning when you either set the scheme explicitly to Mode A, or when you set the scheme to  use Smart Provisioning (Horizon switches between Mode A and Mode B).

Cause: The issue was caused by the fact that after instant clone creation, it's powered on directly from quiesced state. There is no physical state of power off which could finally reflect the BIOS UUID in guest OS.

Solution

In the unlikely event where you are using an application that requires each virtual desktop’s BIOS UUID to be unique, there are two methods to address this issue.

Method 1  Explicitly set the provisioning scheme to Mode B (by disabling parent VMs) globally for each Horizon Pod.  To do so:

In Horizon Console, select Settings > Servers.

Select the server from the list, click More and select Disable ParentVMs.

You can also select Mode B for each instant clone pool / farm if only specific pools / farms use the impacted application.  To do so, please reference  How to switch provisioning scheme for an Instant Clone Pool or Farm (81026)  for instructions

Method 2: (Use this for legacy versions):

Login to the VC which manages the parent vm.

Ensure the parent vm can be used to create instant clones successfully.

Ensure the parent vm is already powered off

Complete the following steps to add one extra entry to the advanced configuration of the parent vm. This extra entry will ensure the instant clone being powered off after creation. After Horizon powers it on, the BIOS UUID will be truly reflected.

Right click on the parent vm

Click Edit Settings

Click VM Options

Expand Advanced

Click Edit Configuration …You will see advanced configurations of the parent vm, as shown in the below screen shot:

Add the entry as depicted in the following screen shot:

Click OK.

Take another snapshot and recreate the instant clone pool.

Related Information

Terminology

Parent Virtual Machine (VM) – A single VM source that is used to deploy a pool of virtual desktops or farm of RDS hosts. A parent virtual machine is sometimes referred to as a parent image, desktop image, or golden image.

Detectable by VMware SkylineTM

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