When deploying Windows Server 2012R2 using an Configmgr OSD Task Sequence, additional disks will be offline when the Task Sequence completes

12:25 pm in 2012R2, CM12, CM12 R2, CM12 R2 SP1, CM12 SP1, CM12 SP2, ConfigMgr 2012, configmgr 2012 R2, ConfigMgr 2012 R2 SP1, ConfigMgr 2012 SP1, OSD by Kenny Buntinx [MVP]


When using a Configuration Manager OSD Task Sequence to deploy Windows Server 2012 or Windows Server 2012 R2 to a server (VM) that contains disks that are not local (such as SAN Disk), when the Task Sequence completes, the additional disks may not come online and may show as offline. Specifically in the Disk Management, the additional disks will show offline with the message:

Disk is offline due to a policy set by an administrator

If you look at my VM, you will see I have 2 separate disks that I will need in a later phase to install the backup software to the D:\ partition, residing on the other vmdk.


To resolve the issue, for the WinPE phase, the steps from KB971436 need to be added to the Task Sequence. For deployments from Operating System Images, a registry key value will need to be updated with the correct SAN policy value as shown below:

Just after the step where you apply the image, create a “RunCommand line called :”load system hive” and execute :” reg load HKUtemp "%OSPART%\WindowsSystem32ConfigSystem"”


Just after the step where you apply the “RunCommand line called :”load system hive”, create a “RunCommand line called :”Change Default SAN policy” and execute :”reg add HKUtempControlSet001HKLMSystemCurrentControlSetServicespartmgrParameters /v SanPolicy /t REG_DWORD /d 1 /f”


Just after the step where you apply the “RunCommand line called :”Change Default SAN policy”, create a “RunCommand line called :”Unload system hive” and execute :”reg unload HKUTEMP”


Next phase is to make sure that no drives will remain offline and all drives will still have the right driveletters assigned . Run a command line with : diskpart /s diskpart.txt


The contents of the diskpart.txt can be determined by yourself . Here is an example


Hope it Helps ,

Kenny Buntinx

MVP enterprise Client Management