linux-ext4 - Re: something's using space, can't figure out what

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Date:	Thu, 11 Apr 2013 11:31:21 +0900
From:	Tomasz Chmielewski <mangoo@...g.org>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: something's using space, can't figure out what - how to debug?

On Wed, 10 Apr 2013 20:26:43 -0400
Theodore Ts'o <tytso@....edu> wrote:

> On Wed, Apr 10, 2013 at 07:56:06PM +0900, Tomasz Chmielewski wrote:
> > # lsof -n|grep /srv
> > # 
> > 
> > 
> > So df says 134 GB is used, while du says 60 GB is used.
> > No removed but used files, according to lsof.
> > 
> > How do I best debug what happened to ~70 GB?
> 
> Well, nothing is using /srv, so why don't you unmount it and run
> "e2fsck -f /dev/xvdf", and see e2fsck reports in terms of the number
> of blocks in use, i.e:
> 
> /dev/lambda/backup: 581320/4915200 files (0.1% non-contiguous),
> 6837767/19660800 blocks

If it was only so easy!

# lsof -n|grep /srv

# fuser /srv

# ls /sys/block/xvdf/holders/

# umount /srv
umount: /srv: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

Yet after reboot, back to normal:

root@ec2:~# df -h /srv
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvdf             194G   62G  123G  34% /srv


-- 
Tomasz Chmielewski
http://www.ptraveler.com
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