The things I get myself into. I hope this solution will be of help to others. Let me first describe the problem. My Zope data.fs was growing at a alarming rate. Friday night, the 2GB file size was exceeded (the 2.5.1 server hosts a popular political site, and has been up non-stop for about a month). The z2.log and STUPID_LOG_FILE revealed nothing odd. A tranalyzer run also showed zope behaving apparently normally. What else could it be? Some malicious anonymous user triggering an insecure process? That should show up in the logs. More likely, it would be a programatic change that I had made myself, causing a runaway write process. But I had not made any changes in over two weeks. Turns out that I had created a HostTracker counter object at about that time: http://www.zope.org/Members/Ioan/HostTracker ...which was merrily populating a table with the statistics of a busy site. Kaboom! I had forgotten to remove this, since getting AWStats to parse the Z2.log for multiple stand-alone Zope virtual hosted sites. So be careful with a HostTracker counter, especially if your site is busy. Don't forget to purge it regularly. Thanks to everyone who helped solve this! Harlow Pinson Indepth Learning Email: hpinson@indepthl.com Web: http://www.indepthl.com Voice: 505-994-2135 FAX: 208-475-7678