Jim Kissel wrote:
>
> Just done a clean minimum install of Debian Etch under VMWare
> Workstation 5.5 and I find df reporting:
> Filesystem 1K-blocks Used Available Use% Mounted on
> /dev/hda1 1359816 287656 1992884 23% /
> udev 10248 56 10184 1% /dev
> devshm 128588 0 128588 0% /dev/shm
> /dev/hda6 2601116 69516 2399469 3% /home
>
> du -s /home reports
> 40 /home
>
>
> du's 40 used blocks != 69516 Used in df
> I know there is a simple explanation, but what is it?
du only reports blocks allocated to files and directories. df reports all block
usage, including inode and superblocks. On ext2/3, these are allocated when the
filesystem is formatted.
du and df should not be expected to match on any filesystem. du computes a
userspace guesstimate of the disk use. df is the FS driver reporting statistics
about how much space is unallocated, which is accurate only with an
understanding of driver internals and should otherwise be considered another
(different) estimate.
Dan
