Re: df discrepencies
On Mon, 01 May 2006 09:14:03 -0500
Kent West <westk@acu.edu> wrote:
> charlie derr wrote:
> > On one of the machines that I oversee there is an issue with the df
> > output that I don't understand.
> >
> > here's a part of the output from df -h
> >
> > /dev/sda1 440G 420G 0 100% /backup
> >
> > if i don't use the -h it looks like this:
> >
> > /dev/sda1 461293804 440335112 0 100% /backup
> >
> > It appears that there really are 20Gigs free, but that column shows
> > 0 -- can i reliably ignore that column and use subtraction with the
> > previous two to compute the true free space?
> I'm going on very hazy memory here, but it might give you enough info
> for googling. If I recall correctly, the system wants at least 10%
> free for "system overhead"; as 20Gig is only about 5% of your 440Gig
> partition, that's why it's showing as 100% used.
>
> Why rebooting would change this number is beyond me.
>
This would make sense with a journaling filesystem such as ext3.
Immediately after a reboot the journal is empty.
--
Liam
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