The NIDP / NESP logs stored at: "/var/opt/novell/nam/logs/idp/nidplogs" are usually not getting used for troubleshooting.Instead the "/var/opt/novell/nam/logs/idp/tomcat/catalina.out" will be used (Echo To Console has to be enabled)
As logging into the XML files cannot be disabled everything will be logged twice. This creates an extra load on the system and doubles the required of disk space used. There is as well a separate rotation running for the catalina.out and the XML logfiles. For heavy loaded systems this might get into low disk space situations.