Please enter the output of
zmcontrol -v into your profile so that people know what version of Zimbra you're using. (Don't post it in the thread.)
If you have NE, you can force a rotation/archive by doing an incremental backup.
Otherwise, it's a bit of a mystery. There are settings that are supposed to control the rotation into /opt/zimbra/redolog/archive. However the last time I tested them, I wasn't seeing the results I expected. It's possible things are working correctly now in ZCS 6.0.8, since on my system, neither the active redolog nor the ones in the archive directory are much more then 100 MB. This is with the following settings:
zimbraRedoLogDeleteOnRollover: FALSE
zimbraRedoLogRolloverFileSizeKB: 102400
zimbraRedoLogRolloverHardMaxFileSizeKB: 4194304
zimbraRedoLogRolloverMinFileAge: 60
See
[SOLVED] Growing redo.log file Force redo log rollover
This might also be of interest:
optimizing usage of /opt/zimbra/redolog/archive/ and rsyncing backups