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Full Discussion: df vs du for directory sizes
Top Forums UNIX for Advanced & Expert Users df vs du for directory sizes Post 302538909 by kalak on Thursday 14th of July 2011 01:16:43 PM
Old 07-14-2011
du reports usage for the files in directories, while df reports on the filesystem itself. Filesystem overhead like a journal, allocation tables, etc. that take space on the filesystem will show as being used by df, but will not show with du, as they are not userspace accessible. Make a new, empty filesystem and du will should nothing but the cluster(s) for the directory(ies) in it, where df will show only the userspace accessible files on the filesystem.

example of a 2G drive ext3, so journal and lost+found directory:
Code:
$df -h /mnt
/dev/sdb1             1.9G   35M  1.8G   2% /mnt
$du -sh /mnt
20K    /mnt

the same with mkfs.vfat (no journal, small allocation table, smaller allocation of for the single directoy):
Code:
$df -h /mnt
/dev/sdb1             1.9G  4.0K  1.9G   1% /mnt
$du -sh /mnt
4.0K    /mnt

My guess is that you've got 200M worth of journal and filesystem allocation information, so you show 1.7G on df (1.7 GB of files) and 1.9G on du (1.7 + 200M filesystem stuff)
 

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LEARN ABOUT SUSE

extlinux

extlinux(1)						      General Commands Manual						       extlinux(1)

NAME

       extlinux - install the SYSLINUX bootloader on a ext2/ext3 filesystem

SYNOPSIS

       extlinux [options] directory

DESCRIPTION

       EXTLINUX is a new syslinux derivative, which boots from a Linux ext2/ext3 filesystem.  It works the same way as SYSLINUX, with a few slight
       modifications.  It is intended to simplify first-time installation of Linux, and for creation of  rescue  and  other  special-purpose  boot
       disks.

       The  installer is designed to be run on a mounted directory.  For example, if you have an ext2 or ext3 usb key mounted on /mnt, you can run
       the following command:

	      extlinux --install /mnt

OPTIONS

       -H, --heads=#
	      Force the number of heads.

       -i, --install
	      Install over the current bootsector.

       -O, --clear-once
	      Clear the boot-once command.

       -o, --once=command
	      Execute a command once upon boot.

       -r, --raid
	      Fall back to the next device on boot failure.

       --reset-adv
	      Reset auxiliary data.

       -S, --sectors=#
	      Force the number of sectors per track.

       -U, --update
	      Updates a previous EXTLINUX installation.

       -z, --zip
	      Force zipdrive geometry (-H 64 -S 32).

BUGS

       I would appreciate hearing of any problems you have with SYSLINUX.  I would also like to hear from you if you have successfully	used  SYS-
       LINUX, especially if you are using it for a distribution.

       If  you	are reporting problems, please include all possible information about your system and your BIOS; the vast majority of all problems
       reported turn out to be BIOS or hardware bugs, and I need as much information as possible in order to diagnose the problems.

       There is a mailing list for discussion among SYSLINUX users and for announcements of new and test versions. To  join,  send  a  message	to
       majordomo@linux.kernel.org with the line:

SEE ALSO

       syslinux(1)

SYSLINUX for ext2/ext3 filesystem				 18 December 2007						       extlinux(1)
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