[CentOS] very large difference between df and du (10 GB, hard to believe )

Peter Kjellstrom cap at nsc.liu.se
Mon Feb 1 16:02:54 UTC 2010


On Monday 01 February 2010, Brian Mathis wrote:
> On Mon, Feb 1, 2010 at 10:36 AM, Matt Iavarone <matt.iavarone at gmail.com> 
wrote:
> > This is typical.  There were probably files deleted from the file
> > system that are still in use by a process.  Restarting the process
> > will release the files and df and du will jive.
>
> That argument only holds until you reach the point in the email where
>
> he said this:
>     > I rebooted on the CentOS v4.8 CD #1, started "linux rescue" :

Indeed. At this point I'd start looking at things hiding under mount points. 
But as the OP seems to have only one filesystem, /, then this will be limited 
to mount-points for special filesystems (like sys, proc and /dev/shm).

What I'm getting at is that you could have, for example, a 10G file /proc/foo 
on the actaul /-filesystem. As soon as proc is mounted on /proc this would be 
invisible.

/Peter

> After the reboot that would be taken care of, so that's not the issue here.
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