SUMMARY: File system full, but not according to du;(

Wow!  That was quick;)

Many thanks to:

Mike Salehi <mike.salehi@kodak.com>
"Mangat, Vicky" <Vicky.Mangat@centrica.co.uk>
"Sjolshagen, Thomas (Tru64 UNIX Eng.)" <thomas.sjolshagen@hp.com>
Rick Rezinas <rick@beerdrinker.org>
Scott M. Sorrentino <scott@sorrentino.net>
Michael Schulte <mike@babbage.cs.umsl.edu>
Matthew Stier <Matthew.Stier@us.fujitsu.com>
Iain Miller <iainonthemove@gmail.com>

Original question:

> Since early this morning one of my partitions have become full:
>
> # df /dptweb
> Filesystem   1K-blocks     Used    Avail Capacity  Mounted on
> /dev/amir0d   25019863 23770030    -1161   100%    /dptweb
>
> However:
>
> # du -s /dptweb
> 6680278 /dptweb
>
> How can I resolve the problem.

Michael's response is the most comprehensive, and doesn't need to be
summarized;)

On Fri, 29 Apr 2005, Michael Schulte wrote:

> Date: Fri, 29 Apr 2005 13:58:05 -0500 (CDT)
> From: Michael Schulte <mike@babbage.cs.umsl.edu>
> To: jjah@sol.ccsf.cc.ca.us
> Subject: Re: File system full, but not according to du;(
>

> The easy solution: reboot
> The hard solution: find the process that is holding a deleted file open, and
>    kill that process.
>
> The problem is (very probably): when a file is deleted, the file space is
>    NOT recovered until all the processes that have the file open have
>    closed it (or died).  Many system processes open a file when they start
>    and never close it; if someone deletes that file, the space is still
>    allocated.
>
> You notice the problem because df and du count the space differently.
>    Df counts space from the inodes (which gives all allocated space);
>    du follows the directory structure, so it only get file space accessible
>    by name.
>
> ---
> Michael Schulte                    Specialist in Computer Science
> Math/CS Dept. (MC-61)              (314) 516 5239
> Univ. of Missouri-St. Louis        schulte@cs.umsl.edu
> One University Boulevard           http://www.cs.umsl.edu/~schulte
> St. Louis, MO  63121  USA

Regards,

Joe
-- 
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