[rrd-users] Question on correct data type

permalink · #1 (**permalink**) 04-13-2007

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Hi,

Recently I began collecting SNMP data from our Bluecoat proxy appliance=
s
for use with RRDtool. One of the OIDs, proxyNumObjects, is confusing th=
e
heck out of me. The documentation states it is of type counter32. My
understanding is that this type would increment until the counter reach=
ed
2^32, at which point it would wrap. As a side note, in my opinion this =
does
not seem to be an appropriate type for this object, because the value w=
ill
fluctuate as the proxy obtains and releases objects. As it happens, tha=
t is
exactly what is happening, as can be seen from the successive polls I h=
ave
pasted below.
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx
..1.3.6.1.3.25.17.3.1.2.0
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583995
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx
..1.3.6.1.3.25.17.3.1.2.0
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583955
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx
..1.3.6.1.3.25.17.3.1.2.0
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583783
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx
..1.3.6.1.3.25.17.3.1.2.0
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583888
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx
..1.3.6.1.3.25.17.3.1.2.0
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583876

Maybe this is just showing my ignorance, but has anyone ever experience=
d a
counter that fluctuates like this? If so, what have you found to be the=

best way to handle it in RRDtool? I have tried counter, and guage....an=
d
out of desperation tried absolute...none of which really depicted what =
I
expected.

Has anyone experienced fluctuating counters? Are they common? How do yo=
u
handle them?

I appreciate any and all help.

Thanks,
Jeff=

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<html><body>
Hi, 
 
Recently I began collecting SNMP data from our Bluecoat proxy appliance=
s for use with RRDtool. One of the OIDs, proxyNumObjects, is confusing =
the heck out of me. The documentation states it is of type counter32. M=
y understanding is that this type would increment until the counter rea=
ched 2^32, at which point it would wrap. As a side note, in my opinion =
this does not seem to be an appropriate type for this object, because t=
he value will fluctuate as the proxy obtains and releases objects. As i=
t happens, that is exactly what is happening, as can be seen from the s=
uccessive polls I have pasted below. 
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx .1.3.6.1.3.=
25.17.3.1.2.0 
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583995 
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx .1.3.6.1.3.=
25.17.3.1.2.0 
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583955 
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx .1.3.6.1.3.=
25.17.3.1.2.0 
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583783 
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx .1.3.6.1.3.=
25.17.3.1.2.0 
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583888 
# /usr/local/bin/snmpget.pl -v 1 -c xxxxxx xxxxxxxxxxxxxxxx .1.3.6.1.3.=
25.17.3.1.2.0 
..1.3.6.1.3.25.17.3.1.2.0 =3D Counter: 4583876 
 
Maybe this is just showing my ignorance, but has anyone ever experience=
d a counter that fluctuates like this? If so, what have you found to be=
the best way to handle it in RRDtool? I have tried counter, and guage.=
....and out of desperation tried absolute...none of which really depicte=
d what I expected. 
 
Has anyone experienced fluctuating counters? Are they common? How do yo=
u handle them? 
 
I appreciate any and all help. 
 
Thanks, 
Jeff</body></html>=

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