CentOS - Apr 2009 - df -h shows system at 100% used, but there is space left

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!

d

On Fri, Apr 24, 2009 at 7:43 PM, dnk <d.k.emaillists at gmail.com>
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?
>
Because when an ext2/3 file system is formated by default 5% is
reserved for root
Use
  tune2fs  -m reserved-blocks-percentage
>
-- 
Laurentiu Coica

On Fri, Apr 24, 2009 at 12:43 PM, dnk <d.k.emaillists at gmail.com>
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
>
This is completely normal rounding. 5.3/903=.005 or .5% - the "human
readable" output doesn't show fractions of a percentage...it rounds.

-- 
Jake Paulus
JakePaulus at gmail.com

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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> 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
I've never run into the reserved blocks being an issue (even though it
may be the case here). I have run out of inodes (one per file, and if
you have a ton of little files...). Run df -i to see what percent inodes
your using. 

Wikipedia has a good explaination of inodes
(http://en.wikipedia.org/wiki/Inode).