[rrd-users] Re: rrdtool fetch returns in scientific notation (help!)

[Sandor W. Sklar]

thanks, I see now the difference between COUNTER and GAUGE.  However, 
when I change that datatype in my "create" statement, and then store 
the values and do the fetch, I now get ...

                       aio

  987015000: NaNQ
  987015300: 3.0000000000e+00
  987015600: 4.0000000000e+00
  987015900: 5.0000000000e+00
  987016200: 5.0000000000e+00
  987016500: 5.0000000000e+00
  987016800: 6.0000000000e+00
  987017100: 7.0000000000e+00
  987017400: 8.0000000000e+00
  987017700: 1.0000000000e+01
  987018000: 1.0000000000e+01
  987018300: 1.0000000000e+01
  987018600: 1.1000000000e+01
  987018900: 1.2000000000e+01
  987019200: 1.2000000000e+01
  987019500: NaNQ

could this be an operating system/compiler combo quirk?

Thanks again!
--Sandy

At 12:46 PM -1000 4/11/01, Clifton Royston wrote:
>On Wed, Apr 11, 2001 at 03:31:38PM -0700, Sandor W. Sklar wrote:
>>
>>  Hi, Folks ...
>>
>>  I'm brand-new at using rrdtool, and I'm trying to get my feet wet
>>  with a simple RRD, but I'm already hitting a problem:
>>
>>  First, I'm using ... $ rrdtool -v
>>  RRDtool 1.0.33  Copyright 1997-2001 by Tobias Oetiker <tobi at oetiker.ch>
>>
>>  ... built on AIX 433, with native C for AIX (xlC) compiler.
>>
>>  I create a new RRD with the command ...
>>
>>  rrdtool create test.rrd --start 987015000 DS:aio:COUNTER:600:U:U
>>  RRA:AVERAGE:0.5:1:300
>
>   A "COUNTER" in RRD terminology is an SNMP counter, and is presumed to
>be used as a source of a rate in units/second; this means that when you
>define an RRD as a Counter, it will not store the values you put into
>it; instead, it is being asked to store the difference between two
>successive stored values, divided by the number of seconds in the
>interval.
>
>   I believe if you look at the numbers here:
>
>>  987015300:3 \
>>  987015600:4 \
>>  987015900:5 \
>>  987016200:5 \
>>  987016500:5 \
>
>  and divide the differences by 300, you will get:
>
>>    987015600: 3.3333333333e-03
>>    987015900: 3.3333333333e-03
>>    987016200: 0.0000000000e+00
>>    987016500: 0.0000000000e+00
>
>   etc.
>
>   If you want it to store unaltered values, you want the GAUGE
>datatype.
>   -- Clifton
>
>--
>  Clifton Royston  --  LavaNet Systems Architect --  cliftonr at lava.net
>    WWJD?   "JWRTFM!" - Scott Dorsey (kludge)   "JWG" - Eddie Aikau

-- 
sandor w. sklar
unix systems administrator
stanford university itss-css

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