If your application requires to store and read files in the directories (applications, generated, docroot, config, lib, java-web-start) that are synchronized by the Application Server, use the doNotRemoveList flag. This attribute takes a coma-separated list of files or directories. Your application dependent files are not removed during server startup, even if they do not exist in the central repository managed by DAS. If the same file exists in the central repository, they will be over written during synchronization.
Use the INSTANCE-SYNC-JVM-OPTIONS property to pass in the doNotRemoveList attribute.
<node-agent name="na1" ...>
<property name="INSTANCE-SYNC-JVM-OPTIONS" value="-Dcom.sun.appserv.doNotRemoveList=applications/j2ee-modules/<webapp_context>/logs,generated/mylogdir"/>