[CentOS] Suddenly increased my hard disk

Thu Apr 7 04:55:56 UTC 2016
Ashish Yadav <gwalashish at gmail.com>

Hi Chandran,

On Thu, Apr 7, 2016 at 9:14 AM, Chandran Manikandan <tech2mani at gmail.com>

> Hi All,
> I have running Centos 6.5 32 bit machine.
> This machine is running qmailtoaster packages and mailbox size is 385 GB.
> if i run the df -h command it show 385 GB out of 1TB
> I have run the same command today suddenly shows 576 GB out of 1 TB.
> I didn't update any bulk file and mail transaction is not very high.
> How do i check this issue and fix it.
> how do i find out and why suddenly showing this much of increasing the size
> of hard disk.
> Could anyone help me

Basically, df reads the superblock only and trusts it completely.  du reads
each object and sums them up.

Any running process can keep a deleted file open. This means the space will
still be reserved and seen by df,
but since du will no longer see a reference to that file in the directory
tree, it cannot see those reserved blocks.

Try to see the number of open file which could be causing the problem.

Ashishkumar S. Yadav