Don't understand df/du output

[Alain AUDEBERT aka 2A]

Le 13 août 2011 à 00:35, Polytropon a écrit :

> On Fri, 12 Aug 2011 23:58:12 +0200, Alain AUDEBERT aka 2A wrote:
>> Hello list,
>> 
>> I having a problem to understand the output of du and df command :
>> 
>> [root at ftp ~]# df -h /opt/
>> Filesystem    Size    Used   Avail Capacity  Mounted on
>> /dev/xbd6     387G    342G     13G    96%    /opt
>> 
>> [root at ftp ~]# du -sh /opt/
>> 342G    /opt/
>> 
>> But 387Go - 342Go not equal to 13Go ! Where's the available space ?
>> (same thing with df -k)
>> 
>> I have try a tunefs -m 1 /dev/xbd6, unmount, mount and nothing change
>> Is it the 8% reserved by FFS ?
> 
> See:
> http://www.freebsd.org/doc/en/books/faq/disks.html#DU-VS-DF


Thank for the link, but in my case du and df are the same used output, and it's not an rm, I launch lsof and no process with a big file :-/

Regards,
Alain
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