[mrtg] SNMP (once again)

[Ashley M. Kirchner]

    Ok, next question:

    Using net-snmp, I have the following OIDs:

    .1.3.6.1.2.1.25.2.3.1.5.1 -> total partition size (in 4K blocks)
    .1.3.6.1.2.1.25.2.3.1.6.1 -> currently used blocks (in 4K blocks)

    So, how do I write my config file to make this messed up formula:

    100 / (total / (current + (total * 0.05))  => % of disk used

    Let me explain the formula:
    As most of us know, on a Unix system, 5% of every partition is
reserved.  When you look at 'df', it reports the amount used, which
INCLUDES that 5%:

Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/hda1              3035920   2084072    797628  73% /

  100 / (3035920 / 2084072) -> 68% (real usage)
  100 / (3035920 / (2084072 + (3035920 * 0.05)) -> 73% (real + reserv)

    I need to figure that out using the above OIDs in my config script.
Anyone want to take a swing at that?  (or tell me a better OID to use,
although I didn't see any)

    [NOTE: I knew there was a reason for me to write disk usage stats
using a raw perl script which read in 'df' results - heh]

    AMK4

--
W |
  |  I haven't lost my mind; it's backed up on tape somewhere.
  |____________________________________________________________________
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  Ashley M. Kirchner <mailto:ashley at pcraft.com>   .   303.442.6410 x130
  SysAdmin / Websmith                           .     800.441.3873 x130
  Photo Craft Laboratories, Inc.             .        eFax 248.671.0909
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