Hi Brad, logrotate is installed. There doesn't seem to be a pattern.
[Thu Aug 18 02:21:30 2011] up2date logging into up2date server
[Thu Aug 18 02:21:34 2011] up2date successfully retrieved authentication token
from up2date server
90 minutes - 1'30''
[Thu Aug 18 03:51:26 2011] up2date
The checkin at 21 minutes after the hour is definitely the regularly scheduled
one. If you take these out, then you have a second pattern starting at 51
minutes past the our at roughly 6 hour intervals. Looks like rhnsd isn't doing
the right thing. Is there only one rhnsd process running?