Duh!!! I forgot about mounting .dmg image files - these appear as disk4 and they don't have much extra space in them and the monitor notices them mounted.
Periodically I get a rash of the following messages:
Sep 25 22:30:00 zimbramon: 3606:crit: Disk warning: machine.domainname.com /dev/disk4s3 at 98%
It's Mac OSX 10.5 with current Zimbra - only been up 2 weeks. I don't have a /dev/disk4s3. There are 3 1TB drives with the 2nd and 3rd mirrored. I am no where near capacity as it's a new installation and Zimbra is the only thing on this system.
Any one have any ideas as to what the monitor is reporting?
Thanks for any pointers.....
(machine.domainname.com is subsituted here for post only)