The value n is the name of a directory in which to store the journal files (the primary directory). When installed, the initial value of this field is “”. After Caché starts for the first time, the actual journal directory is filled in here, such as c:\intersystems\cache\mgr\journal.
The name of an existing directory. The default is the subdirectory journal under the system manager directory.
On the page System Administration > Configuration > System Configuration > Journal Settings , in the Primary journal directory row, select Browse. Select the name of an existing directory.