[rrd-users] RRDTool and counter rollover/resets.

[James Kilton]

Hi,

I'm monitoring DNS query statistics via an SNMP counter and storing the data in RRDTool.  Whenever
I restart the BIND service, the counters reset to 0.  This caused RRDTool to think that the
counter incremented ~4 billion times, causing a huge spike on the graph.

I know there's a formula that's used to determine whether a given counter value is greater than or
less than the prior counter value.  My understanding is that this is how counter rollover/resets
are supposed to be handled: if the formula detects that a counter has decreased, no value is to be
stored for that interval.  This causes an interval's worth of data loss, but is far more desirable
than the huge spikes I'm getting which totally throw off the averages.

Is there a way to have RRDTool take things like this into account to eliminate such spikes?

Thanks,
James

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