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Re: What's wrong with df?

To: Federico Sevilla III <jijo@xxxxxxxxxxxxxxx>
Subject: Re: What's wrong with df?
From: Austin Gonyou <austin@xxxxxxxxxxxxxxx>
Date: Mon, 14 May 2001 10:56:29 -0500 (CDT)
Cc: Linux XFS Mailing List <linux-xfs@xxxxxxxxxxx>
In-reply-to: <Pine.LNX.4.21.0105141844370.3448-100000@xxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
I usually don't put all my eggs in one basket with DF. I use it as a
generic tool, but for accuracy, I use du. Perhaps you can perform du -sk
and compare that to the DF output. You should see good similarities.

Austin Gonyou
Systems Architect, CCNA
Coremetrics, Inc.
Phone: 512-796-9023
email: austin@xxxxxxxxxxxxxxx

On Mon, 14 May 2001, Federico Sevilla III wrote:

> Hi everyone,
> While migrating a ReiserFS partition to XFS, I noticed that df reported a
> pretty significant space utilization difference between the two
> filesystems. I transferred my files using two methods, and both had
> identical results.
> First I used tar from /xfs: "tar -cl /reiserfs | tar xv", then I used cp:
> "cp -a /reiserfs /xfs". Here is the output when I ran "df -h" after each
> file transfer operation:
> Filesystem    Size    Used    Avail   Use%    Mounted on
> /dev/hda5     2.0G    692M    1.4G    33%     /reiserfs
> /dev/hda3     952M    746M    206M    78%     /xfs
> If this is accurate (although it doesn't seem accurate as I will later
> elaborate), then XFS uses 52MB more than ReiserFS does for a relatively
> small partition (this is actually my root partition, and I only exclude a
> small boot and the home partition).
> I decided to check using du by running "du -csm" and found that ReiserFS
> uses 734MB and XFS uses 733MB. This looks more accurate. Would anyone know
> what's wrong with df? It's a much handier tool to use than du, but if it's
> not accurate then it doesn't look like a good tool to use, handy or not.
> Thanks in advance for your comments and suggestions.
>  --> Jijo
> ---
> Linux, MS-DOS, and Windows NT ...
> ... also known as the Good, the Bad, and the Ugly

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