CentOS space lost?

Question

I have a centos 5.5 VM (6GB) just for php development, recently i've noticed about space lost:

df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      5.7G  5.3G  187M  97% /
/dev/sda1              99M   18M   76M  20% /boot
tmpfs                 252M     0  252M   0% /dev/shm

---

du -h / | grep ^[0-9.]*G
1.2G    /www
1.6G    /usr
3.5G    /

I don't have any file in / just .autofsck (0 bytes) where is these space?

Edit: any new idea?

Answer 1

probably in /tmp, but use the following to find directories by size, execute from /:

du -sk */ | sort -nr

Answer 2

If a file has been deleted from the filesystem but not closed by all applications then it will remain on the filesystem taking up space but not be detectable by tools such as du. Terminating the application in question (the easiest way to do this is to reboot) will cause the space to be released.

Answer 3

Have you checked for hidden files/directories? The very simplest command to do that is

du -h * | less

Answer 4

You're heading in the right direction, try adding the a switch to your du command and possibly decreasing the size requirement from G to M granted it will kick back more results but remember you're looking at totals without the -a switch.

du -ah / | grep ^[0-9.]*M

It's probably a log somewhere, but check the sizes of your yum caches too

Answer 5

man tune2fs:

   -m reserved-blocks-percentage
          Set the percentage of the filesystem which may only be allocated
          by privileged processes.   Reserving some number  of  filesystem
          blocks for use by privileged processes is done to avoid filesys-
          tem fragmentation, and to allow system  daemons,  such  as  sys-
          logd(8),  to continue to function correctly after non-privileged
          processes are prevented from writing to  the  filesystem.   Nor-
          mally, the default percentage of reserved blocks is 5%.

So:

tune2fs -m0 /dev/mapper/VolGroup00-LogVol00