imran_ali
in adition to the Hallett_German suggestion consider following.
By default EM will write log messages to both em.log as well as IntroscopeEntepriseManager.log file for e.g
log4j.logger.Manager=INFO, console, logfile
you can remove this double logging by removing console from above\similar statements in IntroscopeEnterpriseManager.properties which by itself should reduce the size drastically.
stop EM before make changes in properties file and delete em.log before starting EM.
Thanks