During an OSD Task Sequence, when the PC boots into WinPE from the Boot Image, the SMSTS.log settings are not controlled via the same registry keys as in the full Windows OS. Instead the SMSTS.log settings are controlled via entries in a file called SMSTS.ini file which resides in the Windows directory of WinPE.
In order to change the logging options for the SMSTS.log file while in WinPE, the SMSTS.ini files has to be either created or modified with the appropriate parameters. If no SMSTS.ini file exists in the Windows directory of WinPE, then default values are used. By default, the SMSTS.ini file does not exist in the default Boot Images of ConfigMgr and therefore the default options are used.
The logging options and values that can be modified are:
The value names are basically the same as the registry value names from the full OS, but without the preceding CCM prefix. Similar to logging in the full OS, for the purposes of the SMSTS.log and OSD, the only three parameters that usually are changed are LOGLEVEL, LOGMAXHISTORY, LOGMAXSIZE. The value of LOGMAXSIZE is specified in bytes.
To modify the values, in NotePad, create a SMSTS.ini file with a [Logging] section that contains the parameters that need to be modified. The file then needs to be injected in the Windows directory of the Boot Image. The SMSTS.ini file has to be in place BEFORE the Task Sequence begins in WinPE. For this reason, the SMSTS.ini file cannot be added or copied to the appropriate location as part of the Task Sequence.
For example, to change the SMSTS.log file size to 5MB, set the log level to the most verbose level, and increase the amount of rolled over/historical logs to 3, the following would be the contents of the SMSTS.ini file:
Note: The logging options in the SMSTS.ini file are case sensitive and should be entered in all uppercase.
Injecting the SMSTS.ini file into the Boot Image
ConfigMgr stores files to be injected into the Boot Images under the following two directories on the site server:
x64 Boot Image
The files located in the above two directories are not necessarily automatically injected into the Boot images. An XML file is used which defines which files need to be injected, where the files are located within the BIN directory, and where they need to be copied to within the WinPE Boot Image. The name of this XML file is osdinjection.xml. It is located in the following directory on the site server:
Please note that the above directory is NOT the same as where the files to be injected reside. Additionally only one osdinjection.xml file is needed for both x86 and x64 Boot Images.
To inject the SMSTS.ini file into the Boot Images:
- Using NotePad, create an SMSTS.ini file with the desired parameters. When saving the file in NotePad, make sure it has the extension of .ini and not .txt.
- Copy the SMSTS.ini file created in Step #1 into the appropriate directories on the ConfigMgr site server where the Boot Images are located. The file has to be copied to two separate directories – one for x86 Boot Image and one for x64 Boot Images.
The directories to copy the file to are:
- Once the SMSTS.ini file is copied to the appropriate directories on the ConfigMgr site server, navigate to the following directory:
- Create a backup of the file osdinjection.xml located in the bini386 directory.
- Open the original osdinjection.xml file in NotePad. Add sections to both the i386 and x64 portions of the osdinjection.xml file specifying to inject the SMSTS.ini file into the Windows directory of the x86 and x64 Boot Image:
- For the x86 Boot Image, find the section:
Add the following section immediately after the above section but before the line containing :
Add the following section immediately after the above section but before the line containing
Once the Distribution Points have finished updating for each Boot Image, each Boot Image should have the updated log settings for the SMSTS.log.
As an option, instead of using the above process, after the SMSTS.ini has been created, it can be manually injected into the Windows directory of the Boot Image using ImageX or DISM. However using the above process preserves and does not modify the original Boot Image (boot.wim), so it is the preferred method.
read here more for enable https://blogs.technet.com/b/system_center_configuration_manager_operating_system_deployment_support_blog/archive/2011/10/12/how-to-change-logging-options-for-smsts-log-in-system-center-configuration-manager-2007.aspx
location of smsts.log file