From: "Doherty, Niall" <niall.doherty@netapp.com>
Hi,
I'm attempting to graph a URLs/sec rate.
The MIB on the cache is counting Total URLs served
so far, and it is of type COUNTER.
I've used a rrd-ds-type = COUNTER to retrieve the
variable. RRD is correctly subtracting the current
value from the previous value and dividing by the
interval to give URLs/sec (averaged over the interval).
However, when the counter rolls over to zero, I get
a huge spike in my graph. I can see this coz I retrieve
the same variable twice (using two different datasource
names) but store using different types (COUNTER and
GAUGE). The GAUGE value shows the time that the count
rolls over - and it is the same time that the COUNTER
value gets the spikes.
Any ideas what could be causing this ? The counter is
a simple integer value...
Cheers,
Niall
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