[rrd-users] RRD smoothing - please help

[johan thoren]

William, thanks for your reply!

I looking to accomplish a five minute graph with integer values like below. 
The problem is that I cant get rid of the double X.XX values that is produced by RRD. 

no.
4.                            ____
3.                     ____
2.       ____
1.____       ____
0.    300. 600. 900. 1200 time

Willia wrote: - "In general, your heartbeat interval should be set greater than the interval at
which you store data.  In example, if you store data to your RRD file every 300
seconds, you may consider setting your heartbeat interval for 600 seconds (or
even 3600 seconds, which is much larger)."- My heartbeat is 100. My RRA is RRA:MAX:0.1:3:1000, meaning three data collection stores to one RRD value every 300 seconds (5 minutes). I can´t stop RRD from approximating the values stored in RRD... I know that ONLY integer values without digits are sent to RRD.

William wrote: "
Your maximum value, for starters, will be largely effected by the
frequency/resolution at which you run your data collection.  So, if you're
only sampling your data every 300 seconds, you'll only get one reading for
that period, not necessarily the maximum value over that period of time.
Someone else with more rrdtool experience can correct me if I'm mistaken."

- I have a separate data collector, which is scheduled to poll data every 100 
seconds. So I know Im getting three data point for every RRD stprage point. 
Is the any specific periods in the 0-100 sec interval which is safe/unsafe?
e.g. will a value stored closer to 0 or 100 somehow get interpolated?

Tack,
Johan


--- Den mån 2008-11-10 skrev William R. Lorenz <wrl at express.org>:
Från: William R. Lorenz <wrl at express.org>
Ämne: Re: [rrd-users] RRD smoothing - please help
Till: "johan thoren" <johan_thoren at yahoo.se>
Kopia: rrd-users at lists.oetiker.ch
Datum: måndag 10 november 2008 22.47

Hej Johan,

On Mon, 10 Nov 2008, johan thoren wrote:

> Im trying to figure out how to configure the RRD tool. My goal is to store
data and ONLY display the maximum value. At a heart beat rate of 100 I store
into RRD for a 300 time interval. See my rrd definition

> DS:sPHI:GAUGE:100:0:1000
> RRA:MAX:0.1:18:1000

> The values I get are typically 1,2,3,4 and NEVER any digits

In general, your heartbeat interval should be set greater than the interval at
which you store data.  In example, if you store data to your RRD file every 300
seconds, you may consider setting your heartbeat interval for 600 seconds (or
even 3600 seconds, which is much larger).

> Why I gods name will RRDtool approximate and display graph- values like
1.3, 0.7, 2.2... This to me does not look like a TRUE maxiumum value, but
instead only an AVERAGE value...

Your maximum value, for starters, will be largely effected by the
frequency/resolution at which you run your data collection.  So, if you're
only sampling your data every 300 seconds, you'll only get one reading for
that period, not necessarily the maximum value over that period of time.
Someone else with more rrdtool experience can correct me if I'm mistaken.

> Is there any way to get thsi basic functionality to work or am I forced to
look for another software then the RRDtool???

Your best bet is to kindly :-) share more information about what you're
trying to accomplish and the specific application surrounding your use of
rrdtool.  That might encourage more help/insights from the mailing list.

Hope this helps.  Ha det så bra!

-- William R. Lorenz


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