Another great use for this feature would be using a single data source
to track the
1) absolute number of printed pages on a printer
2) printed page rate - per minute/hour/day
from a single data source (page counter)
Chet Luther wrote:
I've got something for the group to ponder over the weekend, if you
wish to that is... I'm trying to track the number of BGP peers on
our edge routers, and I can get the number and store it as a GAUGE to
give the appropriate graph as into quantity of peers. However, I'd
like to also track the rate of change of this number, so I created
another data point for each data source to be DERIVE.
My problem is this: When I add the second data point, the DERIVE
graph starts working, however there's no more data plotted for the
GAUGE graphs.
simplified:
1 data source -> 2 data points
1 data point -> 1 graph (total 2 graphs for each data source)
I'm only getting graphed output from one data point though.
This is a known limitation/problem/decision. Up until reading this
post I had never seen a good reason to record the collected value of a
single OID into multiple data points, but this makes complete sense.
I've added ticket #2506 to allow the same value to be recorded in the
RRD file of multiple data sources.
Ticket #2506:
http://dev.zenoss.org/trac/ticket/2506
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