Hi Patrick,
Are you using SEP 12.1 RU1 Small Business Edition, by any chance? If so, you may be encountering a known issue.
Symantec Endpoint Protection Manager (SEPM) Database Transaction Log (sem5.log) Consumes Hard Drive Space in SEP SBE 12.1 RU1
Article: TECH178718 | Created: 2012-01-11 | Updated: 2012-02-29 |
Article URL http://www.symantec.com/docs/TECH178718
Contact Technical Support for confirmation, and access to a tool that will fix the issue (if it is indeed what you are experiencing!)
Hope this helps,
Mick