du and df discrepancy

[Pawel Jakub Dawidek]

On Tue, Oct 16, 2007 at 12:29:48PM -0400, Bill Vermillion wrote:
> du - shows the amount of blocks used by the system
> df - shows the amunt of space it thinks is being used.
> 
> The latter will compute the length of sparse files so df
> will show less free space than du.  Sparse file will have 
> blocks of no data in them.  These are typically created
> by database programs.

Please, verify before giving an answer. Neither du(1) nor df(1) include
sparse blocks in their calculations:

	# ls -lh /mnt/tmp/foo
	-rw-r-----  1 root  wheel    10G 16 pa# 23:19 /mnt/tmp/foo
	# df -h /mnt/tmp/foo
	Filesystem    Size    Used   Avail Capacity  Mounted on
	/dev/md0      9.4M     52K    8.6M     1%    /mnt/tmp

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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