CentOS - Nov 2014 - strange disk space calculation ext4 df and du

Hi,

in one server I do have a SSD raid 1 size 219GB.

df shows 9.4 GB free, 198GB used.

If I do "du -sch * | sort -h -r" on /, I just have close to 3.5GB used
....

Any hints, what's eating up the space?

Centos 6.6, fs = ext4.

	regards . G?tz

-- 
G?tz Reinicke
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On Mon, Nov 03, 2014 at 04:53:05PM +0100, G?tz Reinicke - IT Koordinator
wrote:
> in one server I do have a SSD raid 1 size 219GB.
> 
> df shows 9.4 GB free, 198GB used.
> 
> If I do "du -sch * | sort -h -r" on /, I just have close to 3.5GB
used ....
> 
> Any hints, what's eating up the space?
Deleted files (check out the output of 'lsof' and look for deleted
files)?  This happens a lot when your log rotation system rotates a
log but the daemon logging to it isn't restarted or told to use the
new log files.

Also, you could have sparse files (read the man page for 'du' under
--apparent-size) that appear to be using more space than 'du' normally
reports. 

-- 
Jonathan Billings <billings at negate.org>

On Nov 3, 2014, at 7:53 AM, G?tz Reinicke - IT Koordinator <goetz.reinicke at
filmakademie.de> wrote:
> Hi,
> 
> in one server I do have a SSD raid 1 size 219GB.
> 
> df shows 9.4 GB free, 198GB used.
> 
> If I do "du -sch * | sort -h -r" on /, I just have close to 3.5GB
used ....
> 
> Any hints, what's eating up the space?
> 
> Centos 6.6, fs = ext4.
> 
> 	regards . G?tz
The ext[234] filesystems reserve a certain amount of space for use by root only.
If I remember correctly, the default if 5%, but you can tune that with
tune2fs(8) or mkfs.ext4(8). The df command subtracts the reserved space when it
shows the amount free.  So an empty 1GB filesystem would show as having 950 MB
free.

Hope that helps?

Rick

On Mon, 03 Nov 2014 16:53:05 +0100
G?tz Reinicke - IT Koordinator <goetz.reinicke at filmakademie.de> wrote:

...
> df shows 9.4 GB free, 198GB used.
> 
> If I do "du -sch * | sort -h -r" on /, I just have close to 3.5GB
> used ....
Next thing to check is stuff hiding under mount points. That is for
example the /tmp directory on the root fs containing stuff but another
fs then mounted on /tmp hiding that.

/Peter