[rrd-users] Bizarre numbers

Wendy Faulkner faulkner at eco.utexas.edu
Wed Jul 25 16:05:06 MEST 2001

I created a rrd file with the following command:

rrdtool create daily.rrd --start 994654800 --step 3600
DS:received:GAUGE:6000:U:U DS:delivered:GAUGE:6000:U:U
DS:bounced:GAUGE:6000:U:U RRA:MAX:0.5:1:600 DS:deferred:GAUGE:6000:U:U
RRA:MAX:0.5:6:700 RRA:MAX:0.5:24:775 RRA:MAX:0.5:288:797

I update it every hour with a perl script.  But the numbers end up wacky

I.e. I saw this in the file just now:

 996040800: 9.0700000000e+02 9.8400000000e+02 9.3000000000e+01 4.2100000000e+02
 996044400: 1.0350000000e+03 1.1680000000e+03 9.4000000000e+01 4.5000000000e+01
 996048000: 9.5800000000e+02 1.0430000000e+03 1.3100000000e+02 4.2800000000e+02
 996051600: 9.0700000000e+02 9.9500000000e+02 9.7000000000e+01 4.1600000000e+02
 996055200: 7.2900000000e+02 8.1400000000e+02 1.1300000000e+02 4.0600000000e+02
 996058800: 9.7400000000e+02 1.0600000000e+03 1.2000000000e+02 6.6000000000e+01
 996062400: 1.2530000000e+03 1.4630000000e+03 1.0400000000e+02 4.1100000000e+02
 996066000: 1.8810000000e+03 2.2610000000e+03 1.2000000000e+02 4.6900000000e+02
 996069600: 2.1080000000e+03 2.6100000000e+03 1.4600000000e+02 4.3000000000e+02

And those numbers are all wrong.  But if I recreate the rrd file, then run
the perl script again for today's numbers, the correct numbers get entered:

996040800: 8.5700000000e+02 9.5100000000e+02 1.7400000000e+02 4.2000000000e+02
 996044400: 8.8900000000e+02 1.0230000000e+03 7.9000000000e+01 1.3100000000e+02
 996048000: 9.1100000000e+02 1.0580000000e+03 8.9000000000e+01 4.8900000000e+02
 996051600: 9.0600000000e+02 1.0160000000e+03 8.6000000000e+01 4.8600000000e+02
 996055200: 7.9300000000e+02 9.0400000000e+02 1.1000000000e+02 2.3600000000e+02
 996058800: 8.6300000000e+02 6.2200000000e+02 4.7000000000e+01 3.2500000000e+02
 996062400: 9.2700000000e+02 7.0000000000e+00 4.0000000000e+00 4.4600000000e+02
 996066000: NaN NaN NaN NaN
 996069600: NaN NaN NaN NaN

The numbers only seem to get screwed up after running for over a day.
Anyone have any conceivable idea what could be happening?  My other rrd's
seem fine.  I'm just confused.  No idea where its coming up with the numbers
          Wendy Faulkner             Don't knock on Death's door. 
      faulkner at eco.utexas.edu	     Ring the bell and run away.
 http://www.eco.utexas.edu/~faulkner He hates that.

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