[rrd-users] How is the "now" value is calculated

jonjsilver jonathan.silver at unify.com
Tue May 27 22:43:07 CEST 2014

I am using ganglia, but ganglia calls rrdtool to create the graph, so I'm not
sure if its a parameter issue from ganglia or the way rrdtool behaves. Any
pointers are appreciated. 

When I select to display a metric in ganglia, I get the last hour, last 2
hours, 4 hours, day, week, month and year. 

Each graph has a "now" value display as part of that graph and I'm wondering
from where and how that value is calculated.  Our metrics are all defined as
gauges (because they com through various tooling like sflow or jmxtrans or
gmetric. some support type, other do not). 

The metric I'm collecting is an integer counter. But I'm sometimes seeing
the max (and last) value as NN.nn  where nn is not 00. Why would this (or
the max value) never always be a whole number? 

When I look at the metrics being collected, I do see Slope=BOTH - does that
have impact here?
when I dump the rrds, I also noticed that there are only <cf> entries for
AVERAGE but this is true for the standard ganglia metrics like cpu_system 

trying to figure out how this works so that I can explain it to the OPS
people or is we need to change something.

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