You have a computer that is running Windows Server 2008 R2 or Windows Server 2008 R2 Service Pack 1 (SP1)
You have configured Microsoft iSCSI Software Target 3.3
You start the upgrade of the operating system to Windows Server 2012.
When you proceed through the Upgrade wizard, the compatibility report shows the following message:
Installing Windows will affect the following features:
Setup has detected that Microsoft iSCSI Software Target or Microsoft iSCSI VDS/VSS providers are installed on this computer. They will no longer function after the upgrade and configuration settings will be lost You must follow the instructions at <Link> prior to the upgrade to ensure they can continue to work after successful upgrade.
In this scenario, setup gives you a warning that, Microsoft iSCSI Software Target 3.3 or Microsoft iSCSI VDS/VSS providers may not be functional after the upgrade. It is best to uninstall the feature, then enable the feature after upgrade the server to Server 2012.
In Windows Server 2012, the Microsoft iSCSI Software Target and Microsoft iSCSI VDS/VSS providers are available as a built-in sub feature of the File and Storage Services Role.
To resolve this problem, the settings from earlier versions of Microsoft iSCSI Software Target must be manually imported and the Microsoft iSCSI Software Target should be un-installed from down level operating systems before performing the upgrade to Windows Server 2012.
The following steps can be used to export and import the Microsoft iSCSI Software Target 3.3 configuration settings:
Open an elevated Windows PowerShell prompt, and change directory to C:\Program Files\Microsoft iSCSI Software Target
Make sure your ExecutionPolicy can run scripts. You can temporarily set the execution policy to unrestricted for just the current session, using the following command: Set-ExecutionPolicy Unrestricted
Run the following command to export the Microsoft Software Target 3.3 configuration settings: