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Full Discussion: Phantom space usage in /
Operating Systems Linux Red Hat Phantom space usage in / Post 302897872 by Don Cragun on Wednesday 16th of April 2014 01:39:35 PM
Old 04-16-2014
This has been covered many times before.

Basically, what you are describing is what happens when someone removes a file that a process still has open. At some time in the past did you look for and remove a few large files? If so, did you kill off the processes that were reading from or writing to those files before you removed them?
 

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MSDOSFS(5)						      BSD File Formats Manual							MSDOSFS(5)

NAME
msdosfs -- MS-DOS file system SYNOPSIS
options MSDOSFS DESCRIPTION
The msdosfs driver will permit the FreeBSD kernel to read and write MS-DOS based file systems. The most common usage follows: mount -t msdosfs /dev/ada0sN /mnt where N is the partition number and /mnt is a mount point. Some users tend to create a /dos directory for msdosfs mount points. This helps to keep better track of the file system, and make it more easily accessible. It is possible to define an entry in /etc/fstab that looks similar to: /dev/ada0sN /dos msdosfs rw 0 0 This will mount an MS-DOS based partition at the /dos mount point during system boot. Using /mnt as a permanent mount point is not advised as its intention has always been to be a temporary mount point for floppy and ZIP disks. See hier(7) for more information on FreeBSD direc- tory layout. SEE ALSO
mount(2), unmount(2), mount(8), mount_msdosfs(8), umount(8) AUTHORS
This manual page was written by Tom Rhodes <trhodes@FreeBSD.org>. BSD
October 1, 2013 BSD
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