The following two site roles are of particular importance to Operating System Deployment in System Center 2012 Configuration Manager.
State Migration Point Site Role
The state migration point (SMP) is a System Center 2012 Configuration Manager site role that provides a secure location to store user state information before an operating system deployment. You can store the user state on the SMP while the operating system deployment proceeds and then restore the user state to the new computer from the SMP. Each SMP site role can only be a member of one System Center 2012 Configuration Manager site.
PXE Service Point Site Role
You use the PXE protocol to initiate operating system deployments to Configuration Manager clients. Configuration Manager uses the PXE service point site role to initiate the operating system deployment process. The PXE service point must be configured to respond to PXE boot requests made by Configuration Manager clients on the network and then interact with Configuration Manager infrastructure to determine the appropriate installation actions to take.
Programming the Site Roles
Most information about Configuration Manager site roles is stored in the Configuration Manager site control file.
You can make updates to the site control file through Windows Management Instrumentation (WMI) by using the SMS_SiteControlFile class. In managed code, IResultObject allows access to the site control file. For more information, see About the Configuration Manager Site Control File.
The properties you will need to access are stored as system resources in the site control file. For example, the following site control file section shows the properties for the PXE service point site role.
BEGIN_SYSTEM_RESOURCE_USE RESOURCE<Windows NT Server><["Display=\\SERVERNAME\"]MSWNET:["SMS_SITE=ABC"]\\SERVERNAME\> ROLE<SMS PXE Service Point> PROPERTY <Server Remote Name><><><0> PROPERTY <IsActive><><><1> PROPERTY <BindPolicy><><><1> PROPERTY <ResponseDelay><><><15> PROPERTY <PXEPassword><><><0> PROPERTY <AuthType><><><0> PROPERTY <UserName><><><0> PROPERTY <CertificateType><><><0> PROPERTY <CertificateExpirationDate><128568119567070000><><0> PROPERTY <CertificateFile><><><0> PROPERTY <PXECertGUID><XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX><><0> BEGIN_PROPERTY_LIST <BindExcept> <11:11:11:11:11:11> <22:22:22:22:22:22> END_PROPERTY_LIST BEGIN_PROPERTY_LIST <Objects Polled By Site Status> <["Display=\\SERVERNAME\C$\Program Files\Microsoft Configuration Manager\"]MSWNET:["SMS_SITE=ABC"]\\SERVERNAME\C$\Program Files\Microsoft Configuration Manager\> END_PROPERTY_LIST END_SYSTEM_RESOURCE_USE
When you have access to the site control file, the various properties are stored as embedded properties or in embedded property lists. For example UserName in the sample above is an embedded property. Other properties are stored as embedded property lists. In the example above, the MAC addresses in BindExcept are stored in an embedded property list.
TasksHow to Set the Restore-Only Mode for a State Migration Point
How to Track Operating System Deployment Migrations in Configuration Manager
ConceptsAbout the Configuration Manager Site Control File
Configuration Manager Operating System Deployment
Configuration Manager Programming Fundamentals
Operating System Deployment Site Role Configuration