[rrd-users] Re: Difference between the values read and the values stored
Alex van den Bogaerdt
alex at ergens.op.het.net
Tue Sep 23 15:46:13 MEST 2003
On Tue, Sep 23, 2003 at 01:32:51PM +0200, David Knecht wrote:
> I'd like Cacti 0.8.3 and RRDtool 1.0.39 to store and graph ***exactly***
> the value that it gets as its input.
Then you have to tell RRDtool to store at ***exactly*** the right time.
> As you can see there is a slight difference between what Cacti reports
> and what rrdtool stores/graphs (in fact, each value differs towards its
> preceding value).
> Does this mean that RRDTool does not/cannot store values in its raw
> form, even if using GAUGE data types? Is it correct that RRDTool is
> doing some time compensation even for GAUGE data types (which to my
> latest understanding are not related to time?) Might any other averaging
> mechanism fool me here?
COUNTER -> rate = delta(counter)/delta(time)
ABSOLUTE -> rate = (value)/delta(time)
GAUGE -> rate = value.
rate -> normalization -> RRA.
*If cacti is using something similar to "rrdtool update N:12345" then
what is "N"?
N is approximately "09/22/2003 9:40 AM". N is not exactly "09/22/2003 9:40 AM"
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