Re: host-resources disk usage in bytes

Hi Dave,

On 1/9/07, Dave Shield <[email protected]> wrote:
> On 09/01/07, Deon van der Merwe <[email protected]> wrote:
> > According to net-snmp disk usage percentage is: 78.20%
> > Different than df, but df is also strange...
> > [dvdm@kaus] df -B4096
> > Filesystem           4K-blocks      Used Available Use% Mounted on
> > /dev/sda3              8517017   6661036   1423331  83% /
> >
> > Again it reports 83% use, but if you do the calculation yourself you
> > get: 78.20% which is the same as net-snmp... but what about this 83%
> > then?
>
> Traditionally, Unix filesystems have reserved a small percentage of the
> disk for "root-only" activity.  This is therefore not available for general use.
> You'll note that User+Available = 8084367,  which is not the same as the
> total size.
>      6661036/8084367 = 82.3%

Thanks for the pointer in the right direction.  The confirmation is in
the documentation:
================
man mke2fs
...
  -m reserved-blocks-percentage
    Specify the percentage of the filesystem blocks reserved for the
    super-user.  This avoids fragmentation, and allows root-owned daemons, such
    as syslogd(8),  to  continue  to function correctly after
non-privileged processes
    are prevented from writing to the filesystem.  The default percentage is 5%.
...
================

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