[rrd-users] Re: Spikes

[Daniel Rinehart]

> This looks like a reset to me, not a wrap.  Not sure about the 8510 but
> on the 5500 series the snmp counters will reset too when you issue a
> clear counters command from the prompt.
> Unfortunately the snmp uptime is *not* reset when doing this ...

	Looks like I'll need to talk to Cisco on Monday then, because I'm
not issuing a clear at all. I've also since observed this odd wrapping
behavior just watching the output of 'show interface' without SNMP
involved. At least, the interface isn't saying I am (output of sh int atm
0/0/1):

  Last clearing of "show interface" counters never
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     17581 packets input, 931793 bytes, 0 no buffer

> delta should be 4291541058. That's 4,291,541,058.  Divided by 300 (5min)
> you should get a spike with size 14M.  Correct?

	Yup. The are always in the range of 14-15M. This is a dump of the
"spiked" section from the RRD database, as generated from the data posted
in my earlier message:

<!-- 1999-12-04 06:45:00 EST --> <row><v> 1.0106976708e+02 </v></row>
<!-- 1999-12-04 06:50:00 EST --> <row><v> 9.4598140716e+01 </v></row>
<!-- 1999-12-04 06:55:00 EST --> <row><v> 1.0237584918e+02 </v></row>
<!-- 1999-12-04 07:00:00 EST --> <row><v> 1.4162561428e+07 </v></row>
<!-- 1999-12-04 07:05:00 EST --> <row><v> 1.4268386264e+05 </v></row>
<!-- 1999-12-04 07:10:00 EST --> <row><v> 1.0373755191e+02 </v></row>
<!-- 1999-12-04 07:15:00 EST --> <row><v> 1.0108732455e+02 </v></row>

- Daniel R. <danielr at ccs.neu.edu> [http://www.ccs.neu.edu/home/danielr/]

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