Strange df

[Brian A. Seklecki]

The math is off because some space is reserved for UID 0 / root.  Read
these two man pages:

~BAS

NEWFS(8)       FreeBSD System Manager's Manual               NEWFS(8)

NAME
     newfs -- construct a new UFS1/UFS2 file system

     -m free-space
  The percentage of space reserved from normal users; the minimum
  free space threshold.  The default value used is defined by
  MINFREE from <ufs/ffs/fs.h>, currently 8%.  See tunefs(8) for
  more details on how to set this option.



TUNEFS(8)   NetBSD System Manager's Manual        TUNEFS(8)

NAME
     tunefs -- tune up an existing file system

  -m minfree

 This value specifies the percentage of space held back from nor-
  mal users; the minimum free space threshold.  The default value
  is set during creation of the filesystem, see newfs(8).  This
  value can be set to zero, however up to a factor of three in
  throughput will be lost over the performance obtained at a 5%
  threshold.  Note that if the value is raised above the current
  usage level, users will be unable to allocate files until enough
  files have been deleted to get under the higher threshold.



On Fri, 2007-10-05 at 12:12 +0200, Albert Shih wrote:
> Hi all
> 
> What's that mean ? 
> 
> Filesystem  1K-blocks     Used    Avail Capacity  Mounted on
> /dev/ad4s1a    507630    69050   397970    15%    /
> devfs               1        1        0   100%    /dev
> /dev/ad4s1g  78017664 55539220 16237032    77%    /home
> /dev/ad4s1e    507630    -8960   475980    -2%    /tmp
> 			^^^^^^
> 
> Regards.
> 
> 
> 
> 
> --
> Albert SHIH
> Observatoire de Paris Meudon
> SIO batiment 15
> Heure local/Local time:
> Ven 5 oct 2007 12:11:30 CEST
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