[input] [input] [input] [input] I recently inherited the
task of the care and feeding of an RRD that the company has had running for
years. Overall there have been no obvious problems with it until some recent
changes in management necessitated some new reports. The RRD contains several
metrics read from various sensors. Readings are taken and RRD is updated
hourly. Some input values change very little, if at all, over a span of
several hours. When plotted on a graph, all looks pretty good. Now, the new
boss (God love him) wants a printout of the numbers. Easy enough, but I've
found that there is a slight discrepancy when a given datasource value changes.
For example, actual readings for eight hours might be 3,3,3,3,3,1,1,1. When
the that data is fetched to be printed, the values stored are 3,3,3,3,3,2,1 1.
In this example the transition from "3" to "1" seems to 'buffer' the change
with a "2". Is this a function of the way the database was
set up initially? Is this done to smooth the plotted line in a graph? And is
there a way to have the actual data updated and stored without the intermediate
value being rounded up or down? To further complicate matters, the version of
rrdtool in use is 1.0.49, the latest available in the current stable Debian
release. I admit near total ignorance in the RRD world, so I'm basically
learning as I go, with the hopes that things can be tweaked to everyone's
liking without having to reinvent the wheel.
Any suggestions are greatly appreciated!
Dennis B.
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