[rrd-users] 5 second resolution definition.

[Gerhardus.Geldenhuis at gta-travel.com]

Hi
(Try again... with reply to all.)
Thanks for the reply! I just realized my question was a bit vague...

   rrdtool create test.rrd             \
            --start 920804400          \
            DS:speed:COUNTER:600:U:U   \
            RRA:AVERAGE:0.5:1:24       \
            RRA:AVERAGE:0.5:6:10

I am referring to the last two lines; the 0.5 value. I understood that
to be where the frequency of sampling is set.

from the example on
http://oss.oetiker.ch/rrdtool/tut/rrdtutorial.en.html
RRA:AVERAGE:0.5:1:24
RRA:AVERAGE:0.5:6:10

and keeps 24 samples (24 times 5 minutes is 2 hours). The other averages
6 values (half hour) and contains 10 such averages (e.g. 5 hours)


I am reading the rrdcreate page now so should hopefully find my answer
in there.

Regards 

> -----Original Message-----
> From: rrd-users-bounces at lists.oetiker.ch 
> [mailto:rrd-users-bounces at lists.oetiker.ch] On Behalf Of Simon Hobson
> Sent: 19 September 2008 14:28
> To: rrd-users at lists.oetiker.ch
> Subject: Re: [rrd-users] 5 second resolution definition.
> 
> <Gerhardus.Geldenhuis at gta-travel.com> wrote:
> 
> >I am trying to define an RRA for my graph but I do not 
> understand how 
> >to define the "part" section of the RRA definition
> 
> "part" section ?
> 
> >5 minutes = 0.5
> >1 minute = 0.25
> >
> >However I dont understand how this value is determined. I do not 
> >understand how 5 minutes can be 0.5 and 1 minute be 0.25. I 
> can't see 
> >any relation so I dont know how to deduce anything further from it.
> >Googling has only turned up 5 and 1 minute examples so far.
> 
> http://oss.oetiker.ch/rrdtool/doc/rrdcreate.en.html
> 
> 
> I think you are getting confused.
> 
> step sizes are defined in seconds - so "5" for 5 seconds in 
> the rrd definition.
> 
> Then you need to define one or more DSs, and here you need to 
> define "heartbeat" - how long you can go between samples 
> before the data is deemed to be invalid. Again, this is 
> defined in seconds.
> 
> And lastly, define one or more consolidation functions (CF). 
> I thik this is where you are getting confused, as "0.5" and 
> "0.25" sound like xff values : "xff The xfiles factor defines 
> what part of a consolidation interval may be made up from 
> *UNKNOWN* data while the consolidated value is still regarded 
> as known." A value of 0.5 means that HALF of the values in 
> the consolidation interval may be unknown before the whole 
> interval is considered unknown.
> 
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