Date: Wed, 7 Nov 2001 17:20:04 -0800 (PST) From: Cyrille Lefevre <clefevre@citeweb.net> To: freebsd-doc@freebsd.org Subject: Re: docs/31821: new FAQ: du/df Message-ID: <200111080120.fA81K3930717@freefall.freebsd.org>
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The following reply was made to PR docs/31821; it has been noted by GNATS.
From: Cyrille Lefevre <clefevre@citeweb.net>
To: mwlucas@blackhelicopters.org
Cc: FreeBSD-gnats-submit@freebsd.org
Subject: Re: docs/31821: new FAQ: du/df
Date: Thu, 8 Nov 2001 02:14:57 +0100 (CET)
mwlucas@blackhelicopters.org wrote:
[snip]
> + <para>When a program has a file open, and you delete the
> + file, it isn't really deleted until the program releases
> + the file. You can see this easily enough with a program
> + such as <command>more</command>. If you delete a file
> + while using <command>more</command> on it,
> + <command>more</command> doesn't immediately choke and
> + complain that it cannot view the file. You cannot access
> + the file from anywhere except that <command>more</command>
> + window. If the file is large enough,
> + <command>df</command> will show that it is gone. The
^^ du
> + space the file took up is now designated free.
> + <command>du</command> will show that it is still there, as
^^ df
> + the space the file uses is still technically in use. Once
> + you end the <command>more</command> session,
> + <command>du</command> and <command>df</command> will
> + agree.</para>
> +
> + <para>Note that softupdates can delay the freeing of disk
> + space; you might need to wait up to 30 seconds for the
> + change to be visible!</para>
> +
> + <para>This situation is common on web servers. Many people
> + set up a FreeBSD web server and forget to rotate the log
> + files. The access log fills up <filename>/var</filename>.
> + The new administrator deletes the file, but the system
> + still complains that the partition is full. Stopping and
> + restarting the web server program would free the file,
> + allowing the system to release the disk space. To prevent
> + this from happening, set up &man.newsyslog.8;.</para>
^
never delete such file, but empty it by copying /dev/null
to it (cp /dev/null logfile) or
> + </answer>
> + </qandaentry>
Cyrille.
--
Cyrille Lefevre mailto:clefevre@citeweb.net
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