A common problem for CSA/Gateway users is that their /var/log/messages files build up to be 20-30 gb each, a few of those and your disk will fill and the product will stop functioning.
A quick fix is to add this crontab that will remove all old logs once a week on Mondays at 3:00 AM:
1. SSH into your CSA/Gateway as admin
2. Switch to root: sudo -s
3. List the current crontab: crontab -l
4. Start editing crontab: crontab -e
5. Enter Insert mode: type i
6. Add this line: 0 3 * * 1 rm -rf /var/log/messages-*
7. Hit esc
8. Save by typing in: :wq