Configuring the Log File Location 
By default, log information is written to the following location:
usr\sap\<System ID>\JC<instance ID>\j2ee\cluster\change\log\<cluster-nodeID>changes#.log
where # is the sequential number of the file, starting at zero.
You can also specify a custom log file location using the AS Java – Config Tool.
Open the AS Java – Config Tool (<INSTANCE>\j2ee\configtool\configtool.bat).
Under , add a new destination, and set the severity to Info.
Under , add the new destination to the custom configuration of the category.
Save your changes and restart the portal.
Note
To specify a custom log file location for a specific node, perform the previous procedure on the specific node, instead on of the template.