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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd">
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><DIV
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><A
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></A
>Chapter 21. Debugging</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="debugging.html#CHECK_LOG_FILE"
>Check Cacti Log File</A
></DT
><DT
><A
HREF="check_data_gathering.html"
>Check Basic Data Gathering</A
></DT
><DT
><A
HREF="check_cacti_poller.html"
>Check cacti's poller</A
></DT
><DT
><A
HREF="check_mysql_updating.html"
>Check MySQL updating</A
></DT
><DT
><A
HREF="check_rrd_updating.html"
>Check rrd file updating</A
></DT
><DT
><A
HREF="check_rrd_owner.html"
>Check rrd file ownership</A
></DT
><DT
><A
HREF="check_rrd_numbers.html"
>Check rrd file numbers</A
></DT
><DT
><A
HREF="check_rrd_graph.html"
>Check rrdtool graph statement</A
></DT
><DT
><A
HREF="debug_miscellaneous.html"
>Miscellaneous</A
></DT
><DT
><A
HREF="debug_rpm_installation.html"
>RPM Installation?</A
></DT
><DT
><A
HREF="check_zero_values.html"
>Not NaN, but 0 (zero) values?</A
></DT
></DL
></DIV
><P
>Cacti users sometimes complain about NaN's in their graphs.
Unfortunately, there are several reasons for this result.
The following is a step-by-step procedure recommended for debugging.</P
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="CHECK_LOG_FILE"
>Check Cacti Log File</A
></H1
><P
>Please have a look at your cacti log file.
Usually, you'll find it at <TT
CLASS="FILENAME"
><path_cacti>/log/cacti.log</TT
>.
Else see <KBD
CLASS="USERINPUT"
>Settings</KBD
>, <KBD
CLASS="USERINPUT"
>Paths</KBD
>.
Check for this kind of error:</P
><PRE
CLASS="SCREEN"
>CACTID: Host[...] DS[....] WARNING: SNMP timeout detected [500 ms], ignoring host '........'</PRE
><P
>For "reasonable" timeouts, this may be related
to a snmpbulkwalk issue. To change this, see
<KBD
CLASS="USERINPUT"
>Settings</KBD
>, <KBD
CLASS="USERINPUT"
>Poller</KBD
>
and lower the value for
<KBD
CLASS="USERINPUT"
>The Maximum SNMP OID's Per SNMP Get Request</KBD
>.
Start at a value of 2 and increase it again,
if the poller starts working.
(1 or less disables snmpbulkwalk)
Some agent's don't have the horsepower
to deliver that many OID's at a time. Therefore,
we can reduce the number for those older/underpowered devices.</P
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