Logs for the Helix server are split each night into each site's log dir ( /log/helix.log ) which allows you to see files that have been streamed by the helix server. The log file is a standard helix log using style 4 and recording client stats 1 & 2. Details of the log file format can be seen at http://service.real.com/help/library/guides/helixuniversalserver/htmfiles/report.htm#44459.