huge difference between du and df - no open file descriptors

[Nils Effenberger]

On Wed, 30 Jul 2014 17:32:24 +0200
Nils Effenberger <effenberger at work.de> wrote:

> Then I tried to create another (big) file which lead to the
> following:
> 
> 
> root at zhoernchen:~ # dd if=/dev/zero of=/root/test bs=1024
> count=3500000
> 
> /: write failed, filesystem is full
> dd: /root/test: No space left on device
> 38849+0 records in
> 38848+0 records out
> 39780352 bytes transferred in 0.422187 secs (94224517 bytes/sec)
> root at zhoernchen:~ # df -h
> Filesystem          Size    Used   Avail Capacity  Mounted on
> /dev/mirror/root    4.8G    4.8G   -395M   109%    /
> devfs               1.0K    1.0K      0B   100%    /dev
> root at zhoernchen:~ # rm test
> root at zhoernchen:~ # df -h
> Filesystem          Size    Used   Avail Capacity  Mounted on
> /dev/mirror/root    4.8G    4.8G   -395M   109%    /
> devfs               1.0K    1.0K      0B   100%    /dev
> 
> (Note that I deleted the 'test' file without effect.)
> 
> du(1) still shows 2.2G:
> 
> root at zhoernchen:~ # du -shx /
> 2.2G    /
> 
> When I now try to create files I get ENOSPC :(
> 

After running fsck over the mirror, which salvaged a few things df(1)
was showing the right values again but the issue remained:

UFS doesn't release disk space after I delete files. 



--
Nils Effenberger
Junior UNIX-Administration

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