On all operating systems, tprequires a special file structure for transport data, logs, temporary data, and transport control data. The file structure is operating system-dependent, but SAP has tried to keep these differences as small as possible.
tpneeds a transport directory, which is called /usr/sap/trans under UNIX. You can also use any other directory in the file system, but it must exist on every machine in your network where a SAP instance is running (UNIX: mounted, Windows: share). If this is not the case, you cannot install a transport system that runs automatically.
Under Windows, the default path of the transport directory is \\$(SAPTRANSHOST)\sapmnt\trans.
You can find more information on how to address and rename the transport directory in the section Preparing the File Systems.
The transport directory must have the following subdirectories:
Contains the global transport parameter file
Contains the transport data
Contains transport logs, trace files, and statistics
Contains control information on which transports are to be imported into which R/3 Systems and the order of the imports
Contains information on change requests (different steps of a change request and their exit codes)
Contains information for SAP users (the status of each change request)
Contains temporary files (logs, semaphores on files)
Contains action logs for all tasks and requests These files are only changed by the SAP system.
Contains “old” files from other directories that are saved here with the clearold command before being deleted by a later execution of this command