Re: du and df Used Space Inconsistent On Fresh Install

On Fri, 31 Mar 2006 02:13:03 +0100
Nick Boyce <nick@xxxxxxxxxxxxxxxxxxx> wrote:

I've just done a fresh install of Sarge 3.1r1 on an 8Gb partition on
an i386 machine here, basic packages only (no "tasks"), and on
checking space usage before proceeding I'm somewhat bemused by the
fact that du and df radically disagree on how much space has been used
so far.

do you have any nfs or smb mounts that du might be counting? any other mounted partitions that might show up in du that you're not thinking of? did you mount some other partition as /home for example?

just a hunch.

A


In *single-user* mode :

# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hda8 8354340 343808 7491140 5% /

# du -sk /
835383

df says ~340Mb used
du says ~830Mb used
that's quite a difference ....

Googling just comes up with these threads :
http://lists.debian.org/debian-user/1999/12/msg01729.html
df and du disagree

http://lists.debian.org/debian-user/2000/03/msg00670.html
[bug?] df and du -s output inconsistent?

And the only suggestion in either one that makes any sense is that the
difference is explained by the space in the filesystem reserved for
root-only use. This is shown as 104823 4096-byte blocks :

# tune2fs -l /dev/hda8
...
Block count: 2096474
Reserved block count: 104823
...
Block size: 4096
...

Reserved space = 104823 * 4Kb = 419292 Kb

But 419292 + 343808 (from df) = 763100 != 835383 (from du)

It's roughly right, but ~70000 Kb is still missing.

Does anyone think the reserved space is indeed the explanation ?
I'd just like to know, before I go too much further with this
installation, that there isn't something horribly wrong ....

Perhaps there _is_ a bug after all, that I should report.

TIA
Nick Boyce
Bristol, UK
--
/* affect != effect */ void affect(int *thing,int effect) { *thing += effect; }


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