SCCM OSD Boot Images & PXE

Standard

Lately, I’ve been working on a project to deploy a customized Windows 7 MDT task sequence via SCCM 2012 OSD. We had questions re: PXE boot image handling and selection- specifically how SCCM OSD PXE would handle multiple boot images (especially of the same platform.)

We created a new customized (x86) MDT boot image for the project, and had not made it available to PXE. Our old existing (non MDT) x86 and x64 boot images were PXE enabled. Since the new task sequence was using a new boot image that was not available to PXE, after we deployed the TS to the “All Unknown Computers” collection, our PC Technicians were no longer able to image new/unknown systems via PXE. Whoops!

When a system PXE boots, SCCM basically determines which task sequences are available to it, and picks the boot image referenced in the most recently deployed task sequence. If the task sequence you then select uses a different boot image, the system will download it and boot up into it after restarting. In our case, I suspected that Unknown Computers could no longer PXE boot, because the most recent task sequence deployed to that collection was referencing a boot image that was not available to PXE. For more detailed explanation see these posts:

http://blog.configmgrftw.com/boot-image-selection-configmgr/

http://blogs.technet.com/b/michaelgriswold/archive/2012/01/12/which-winpe-will-you-get-from-a-pxe-boot.aspx

We decided to PXE enable the new custom (x86) MDT boot image (by checking the “Deploy this boot image from the PXE-enabled distribution point” checkbox on the “Data Source” tab of the boot image.) I wanted to see what would happen to the old existing x86 boot image.

I checked the \RemoteInstall\SMSImages\ folder structure on our SCCM PXE DP server, and verified that a new folder had been created with the new boot image’s ID. The other x86 and x64 boot image folders were also there.

During testing we confirmed that systems PXE booted with the expected (most recently deployed) boot image. So, the two different x86 boot images coexist just fine on the same PXE server. (We will most likely switch the old task sequences over to use the new MDT boot image in the future, but wanted to keep them both around for now.)

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s