If you need to change any of the default file locations or other parameters, e.g. maximum log file size, you need to edit \{lansa_root\}/lansa.ini with a text editor.
For example, if you install LANSA for Linux to the directory /lansa, the file /lansa/lansa.ini will be created with the following content:
\[Communications\] LicenceTable=/lansa/x_lansa/x_lickey.dat ProcInfoFile=/lansa/lcoproc.ini RouteTable=/lansa/lroute.dat TraceFile=/lansa/log/lroute.trc LogFile=/lansa/log/lroute.log ;TraceMaximum=65536 ;LogMaximum=65536 ;LogStateCheck=N  
The file lists all the file locations and other parameters that you may customize.
Lines starting with a semicolon are remarks and so the semicolons can be used handily as a way to disable/enable a parameter. In the example, for instance, default value for TraceMaximum will be used as the line is remarked out.