Thank you both for the reply.  Robert's reply was perfect, I did not see that button!  I've taken this over from a guy that left,and it appears they have been managing this by purges as  the disk has been  sitting at 100% full for a long time.  So nightly they clear enough space in the DB namespace to allow for new incoming content.  It seems like it makes it difficult to  monitor  as standard snmp tools just see disk space and cannot monitor/alert for how much free space  is  in the DB.  I'm not sure what to do about that.