Date: Thu, 30 Oct 2008 15:38:24 +0100 From: Mel <fbsd.questions@rachie.is-a-geek.net> To: freebsd-questions@freebsd.org Cc: Brendan Hart <brendanh@strategicecommerce.com.au> Subject: Re: Large discrepancy in reported disk usage on USR partition Message-ID: <200810301538.24819.fbsd.questions@rachie.is-a-geek.net> In-Reply-To: <021f01c93a28$651752e0$2f45f8a0$@com.au> References: <021f01c93a28$651752e0$2f45f8a0$@com.au>
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On Thursday 30 October 2008 01:42:32 Brendan Hart wrote:
> Hi,
>
> I have inherited some servers running various releases of FreeBSD and I am
> having some trouble with the /usr partition on one of these boxen.
>
> The problem is that there appears to be far more space used on the USR
> partition than there are actual files on the partition. The utility "df -h"
> reports 25GB used (i.e. nearly the whole partition), but "du -x /usr"
> reports only 7.6GB of files.
>
> I have reviewed the FAQ, particularly item 9.24 "The du and df commands
> show different amounts of disk space available. What is going on?".
> However, the suggested cause of the discrepancy (large files already
> unlinked but still held open by active processes), does not appear to be
> true in this case as problem is present even after rebooting into single
> user mode.
>
> #: uname -a
> FreeBSD ibisweb4spare.strategicecommerce.com.au 6.1-RELEASE FreeBSD
> 6.1-RELEASE #0: Sun May 7 04:42:56 UTC 2006
> root@opus.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP i386
>
> #: df -h
> Filesystem Size Used Avail Capacity Mounted on
> /dev/aacd0s1a 496M 163M 293M 36% /
> devfs 1.0K 1.0K 0B 100% /dev
> /dev/aacd0s1e 496M 15M 441M 3% /tmp
> /dev/aacd0s1f 28G 25G 1.2G 96% /usr
> /dev/aacd0s1d 1.9G 429M 1.3G 24% /var
Is this output untruncated? Is df really df or an alias to 'df -t nonfs'?
> #: du -x -h /usr
> 2.0K /usr/.snap
> 24M /usr/bin
> ....
> <snip>
> ....
> 584M /usr/ports
> 140K /usr/lost+found
> 7.6G /usr
Is it possible that nfs directory got written to /usr at some point in time?
You would only notice this with du if the nfs directory is unmounted.
Unmount it and ls -al /usr/mountpoint should only give you an empty dir.
--
Mel
Problem with today's modular software: they start with the modules
and never get to the software part.
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