cvs commit: src/etc/defaults periodic.conf

[Greg 'groggy' Lehey]

On Tuesday, 31 January 2006 at 21:59:48 +1100, Bruce Evans wrote:
> On Tue, 31 Jan 2006, Gleb Smirnoff wrote:
>
>> On Tue, Jan 31, 2006 at 08:28:16AM +1030, Greg 'groggy' Lehey wrote:
>> G> On Monday, 30 January 2006 at 15:35:25 +0300, Gleb Smirnoff wrote:
>> G> > On Mon, Jan 30, 2006 at 12:33:44PM +0000, Matteo Riondato wrote:
>> G> > M>   Make df output in periodic mail human readable
>> G> >
>> G> > Thanks!
>> G>
>> G> *sigh*
>> G>
>> G> Not everybody is human.
>
> Is somebody who thinks in exponential notation human?

Possibly.  But is -h exponential?  It's far too coarse-grained.

>> The periodic output is for humans. The monitoring software -
>> nagios, remstats, etc runs df (or other tools) itself.
>
> Then it should not use df with the -h (hideous) flag.

Heh.

My main objection to -h is that it's so difficult to read.  Currently
I look at the output and I can see optically the relationships between
the individual file systems.  For example:

  Filesystem        1048576-blocks   Used Avail Capacity  Mounted on
  /dev/ad0s3a                 8905   7924   268    97%    /
  devfs                          0      0     0   100%    /dev
  /dev/ad0s2a                 7929   2385  4908    33%    /5
  /dev/ad0s5                  9388   3615  5296    41%    /ubuntu
  /dev/ad0s7                 27764  14707 11646    56%    /home
  procfs                         0      0     0   100%    /proc
  battunga:/                  3969   2931   721    80%    /battunga
  battunga:/home              5267   1800  3046    37%    /battunga/home
  echunga:/                  14873   8226  5457    60%    /echunga
  echunga:/home               9916   3869  5252    42%    /echunga/home
  echunga:/src              188356 115525 57762    67%    /src
  echunga:/dump             122037  88778 23496    79%    /dump
  wantadilla:/                9912   5813  3305    64%    /wantadilla
  wantadilla:/home           51895  46826   917    98%    /wantadilla/home
  wantadilla:/dumpa          76285  62487  7695    89%    /dumpa
  wantadilla:/dumpb         187780 180114  5788    97%    /dumpb
  /dev/da0s1                   121     16   104    13%    /camera

With -h, this distinction disappears: I need to read each individual
line to compare them:

  Filesystem           Size    Used   Avail Capacity  Mounted on
  /dev/ad0s3a          8.7G    7.7G    268M    97%    /
  devfs                1.0K    1.0K      0B   100%    /dev
  /dev/ad0s2a          7.7G    2.3G    4.8G    33%    /5
  /dev/ad0s5           9.2G    3.5G    5.2G    41%    /ubuntu
  /dev/ad0s7            27G     14G     11G    56%    /home
  procfs               4.0K    4.0K      0B   100%    /proc
  battunga:/           3.9G    2.9G    721M    80%    /battunga
  battunga:/home       5.1G    1.8G    3.0G    37%    /battunga/home
  echunga:/             15G    8.0G    5.3G    60%    /echunga
  echunga:/home        9.7G    3.8G    5.1G    42%    /echunga/home
  echunga:/src         184G    113G     56G    67%    /src
  echunga:/dump        119G     87G     23G    79%    /dump
  wantadilla:/         9.7G    5.7G    3.2G    64%    /wantadilla
  wantadilla:/home      51G     46G    918M    98%    /wantadilla/home
  wantadilla:/dumpa     74G     61G    7.5G    89%    /dumpa
  wantadilla:/dumpb    183G    176G    5.7G    97%    /dumpb
  /dev/da0s1           121M     16M    105M    13%    /camera

In the first output, the size of /dummpb is clearly about 1500 times
the size of /camera (bottom two lines).  In the second output, you
really need to look at the 'G' and the 'M'.

Matteo suggested using -m instead of -k.  Clearly I like that (it's my
default).  But maybe the real question is a matter of scaling.
Clearly something like this looks confusing:

  Filesystem        1K-blocks      Used   Avail Capacity  Mounted on
  wantadilla:/dumpb 192287056 184436908 5927280    97%    /dumpb

So maybe we need a df option that maintains a certain number of
significant digits; for /camera it might correspond to -k:

  Filesystem 1K-blocks  Used  Avail Capacity  Mounted on
  /dev/da0s1    124096 16704 107392    13%    /camera

For most, however, it would correspond to -m.  The important thing is
that it should use the same unit for all file systems mentioned.

Thoughts?

Greg
--
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