[CentOS] df -h shows system at 100% used, but there is space left

Eric Sisolak haldir.junk at gmail.com
Sun Apr 26 04:33:08 UTC 2009


The amount shown under "Avail" does not include the reserve, even if
it is set.  If the reserve is used, then "avail" (and "Use%") become a
negative value.  For example it might say -2.5GB Available.

The "Size" does include the reserve however.

I agree with Jake that this is due to it rounding 99.5% used to a whole number.

--
Eric

On Fri, Apr 24, 2009 at 2:25 PM, Robert Heller <heller at deepsoft.com> wrote:
> At Fri, 24 Apr 2009 09:43:57 -0700 CentOS mailing list <centos at centos.org> wrote:
>
>>
>> Has anyone seen output like this before? Notice on my /dev/md0 That it
>> reports 100% used, but also 5.3 Gb available. What would cause this?
>>
>>
>>
>> # df -h
>> Filesystem            Size  Used Avail Use% Mounted on
>> /dev/sda2              71G  1.6G   66G   3% /
>> /dev/sda1              99M   22M   73M  23% /boot
>> tmpfs                 506M     0  506M   0% /dev/shm
>> /dev/md0              903G  851G  5.3G 100% /home
>>
>>
>> Thanks in advance!
>
> There is a 'reserve' of space, that only root can write to.  In the case
> of /dev/md0 above, normal users will get a 'no space left on device'
> error trying to write files.  root, however, can still manage to write
> another 5.3 gig before encountering this error.  It only shows up as so
> large because the reserve space is a *percentage* of the total file
> system, and /dev/md0 is a huge file system.
>
>>
>> d
>>
>>
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>
> --
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