Hi,
I am using PNP4Nagios that uses rrdtool 1.4.4 on CentOS 5.5 Linux and I am
interested in min/max data points rather than averages.
This may be a rather silly question but when I run the following, which appears
to be analogous to the query PNP4Nagios uses internally:-
rrdtool xport --maxrows=10 --start 1293926400 --end 1294920000
DEF:ds1=PING.rrd:1:MIN XPORT:ds1:"Ping"
I get :-
<?xml version="1.0" encoding="ISO-8859-1"?>
<xport>
<meta>
<start>1293948000</start>
<step>108000</step>
<end>1295028000</end>
<rows>11</rows>
<columns>1</columns>
<legend>
<entry>Ping</entry>
</legend>
</meta>
<data>
<row><t>1293948000</t><v>NaN</v></row>
<row><t>1294056000</t><v>2.6568033333e+00</v></row>
<row><t>1294164000</t><v>2.6110066667e+00</v></row>
<row><t>1294272000</t><v>2.6707200000e+00</v></row>
<row><t>1294380000</t><v>2.7942700000e+00</v></row>
<row><t>1294488000</t><v>2.6270000000e+00</v></row>
<row><t>1294596000</t><v>2.5832666667e+00</v></row>
<row><t>1294704000</t><v>2.6612700000e+00</v></row>
<row><t>1294812000</t><v>2.6822666667e+00</v></row>
<row><t>1294920000</t><v>NaN</v></row>
<row><t>1295028000</t><v>NaN</v></row>
</data>
</xport>
However if I increase the resolution and filter it for points bellow the min
value from above I find values.
rrdtool xport --maxrows=3257 --start 1293926400 --end 1294920000
DEF:ds1=PING.rrd:1:MIN XPORT:ds1:"Ping" |grep 'e+00'|grep '<v>2.[01234]'
<row><t>1294759200</t><v>2.4431000000e+00</v></row>
<row><t>1294759800</t><v>2.4431000000e+00</v></row>
<row><t>1294761600</t><v>2.3702033333e+00</v></row>
<row><t>1294762200</t><v>2.3317700000e+00</v></row>
<row><t>1294762800</t><v>2.3317700000e+00</v></row>
<row><t>1294765800</t><v>2.3038400000e+00</v></row>
<row><t>1294766400</t><v>2.3947933333e+00</v></row>
<row><t>1294767600</t><v>2.4536666667e+00</v></row>
I also have a similar problem with MAX which is hiding spikes I wish to report
on.
Its probably just me needing pointing in the right direction. However I am
seeing spikes in PNP4Nagios's graphs and data being smoothed out which when you
want to report on them a bit of an issue.
Thanks
Paddy
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