I have added MIBs for a zyxel device, and created three graphs which use these MIBs. However, only two out of the three work as expected.
I turned on debug logging level, and I can see that all three data sources are receiving data:
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04/26/2012 12:20:04 PM - CMDPHP: Poller[0] Host[4] DS[8] SNMP: v1: 192.168.1.1, dsname: cpu, oid: .1.3.6.1.4.1.890.1.6.22.1.1.0, output: 6
04/26/2012 12:20:04 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /var/www/cacti/rra/zyxel_net_cpu_8.rrd --template cpu 1335435603:6
04/26/2012 12:20:05 PM - CMDPHP: Poller[0] Host[4] DS[9] SNMP: v1: 192.168.1.1, dsname: ram, oid: .1.3.6.1.4.1.890.1.6.22.1.2.0, output: 58
04/26/2012 12:20:05 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /var/www/cacti/rra/zyxel_net_ram_9.rrd --template ram 1335435603:58
04/26/2012 12:20:06 PM - CMDPHP: Poller[0] Host[4] DS[10] SNMP: v1: 192.168.1.1, dsname: sessions, oid: .1.3.6.1.4.1.890.1.6.22.1.6.0, output: 922
04/26/2012 12:20:06 PM - POLLER: Poller[0] CACTI2RRD: /usr/bin/rrdtool update /var/www/cacti/rra/zyxel_net_sessions_10.rrd --template sessions 1335435603:922
I have tried debugging with all the documentation I was able to find concerning NaN graphs, but I have yet to find the fault.
I have attached the graph and data templates I'm using.
I'm really hoping someone knows what could be wrong, as I have no idea how to troubleshoot this further at the moment