[rrd-users] Re: rrdfetch (what type is the returned data)?

[Alex van den Bogaerdt]

Paul Klinaftakis wrote:
> 
> hi ... when doing an rrdfetch, what type is the returned data?
> 
> For example, I collect my data through MRTG (with logformat: rrdtool). The data are counters but with the Options parameter set to bits. Doing an rrdfetch, what will be the return type (b/s, kb/s, ...)?

Everything is (assumed to be) a rate.  The stored number will depend
on what you input, and on which type of counter you use:

COUNTER will compute   delta(counter) / delta(time)
DERIVE  will compute   delta(counter) / delta(time)
ABSLUTE will compute   counter / delta(time)
GAUGE   will be passed directly

The difference between DERIVE and COUNTER is that DERIVE can go
backwards while COUNTER assumes that a wrap has occured if the newly
received value is lower than the previous one.
ABSOLUTE assumes that delta(counter) is what you give to rrdtool,
GAUGE assumes that { delta(counter)/delta(time) } is given.

The calculation depend on what you input.  If you input bits, the
calculations work with bits and thus bits per second are stored.
Same for bytes, kilobytes, miles, liters, gallons, whatever.

While this is already elaborate you still may want to visit the
mrtg faq and/or read the rrdtool manual pages.

HTH
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