Migrating to the SCCM UDI for OSD, part 3b: Operating System Selection (Continued)

Continued from part 3a:

In part 3a of this series, I provided a script that automates updating of the OS selection dialog boxes in UDI. I also noted that while UDI presents that OS selection, the UDI client ignores the selection and instead installs whichever OS image was specified at image creation time. This was very frustrating because I was able to verify that the syntax of the generated UDI XML file was correct. In examining the task sequence logs, I even could see that the “OSDImageName” and “OSDImageIndex” variables had been set as expected. Yet still UDI would not apply the select image. Why?

I found multiple explanations for this phenomenon, none in the MDT/UDI documentation:

The upshot is, while UDI wizard will set the “OSDImageName” variable, the SCCM Task Sequence ignores it by design. This issue is exposed in the Task Sequence reference:

The observant reader will notice that the “Apply Operating System Image” task sequence step does not contain a variable for supplying an image name or path. You only can provide an image index. It looks like MS only supports selection of different images indexed in one monolithic WIM image. I am not enamored with this limitation, so I have authored the following script which will create one “Apply Operating System Image” for each OS in the SCCM inventory. Each step will have a condition that will allow the step to run only if the OSDImageName environment variable matches the name of the image specified in the task sequence step. Note that we are assuming only one image per WIM file in this case, so the image index of the selected WIM has to be ‘1’.

Note that this script requires the “UVM-ConfigurationManager.psm1” module file, which can be found in this post:

The script will create a single group of Apply Operating System tasks (one task for each OS Image Package in the infrastructure) in the Task Sequence, using the group name supplied in the $TSPackageName variable. If the group already exists, it will be updated. Additionally, if the stock "Apply Operating System Image" step is still present, it will be removed. Each time you add or remove an OS Image, you will need to re-run the script and re-copy/paste the actions.

We have now dealt with handling Drivers and Operating Systems in SCCM/UDI OS deployment. That leaves managing UDI application selection, which I will discuss in part four of this series, coming up next.


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