[rrd-users] AW: Newbie help

[Thorsten Volkmer-Wolf]

Hi [putYourNameHere],


>> DS:rank:GAUGE:604800:0:U

should be "DS:rank:GAUGE:86400:0:U" (means if for more than one day there's no value delivered for the RRA then rrdtool will create a NaN value)

>> RRA:AVERAGE:0.5:1:7

means: take the average of the last "1" value (which actually is no average, that's obvoiusly what you want) and store 7 of them (which means you've collected one weeks values in the first RRA)

>> RRA:AVERAGE:0.5:7:4

means: take the last 7 values, build an average of them and store 4 of those averages. That would deliver a months (4 weeks) results, each averaged over one week.

>> RRA:AVERAGE:0.5:30:12

That seems wrong to me. You say to take the last 30 values and average them, but....there are no 30 values stored. For me it should read like this:

RRA:AVERAGE:0.5:4:12

which takes the last 4 values (you've not held more in the previous RRA), average them and store 12 averaged values, thus giving you 12 times four weeks (which isn't a year at all).


Correct me, rrd fellows, if i'm wrong.


Hope this helps,

	Thorsten

++
Dipl.-Ing.
Thorsten Volkmer-Wolf
IT-Support & Services

AEROTEC Engineering GmbH
Hein-Saß-Weg 38
21129 Hamburg / Germany

fon +49 (0)40/742 198-241
fax +49 (0)40/742 198-111

<http://www.aerotec.de>


-----Ursprüngliche Nachricht-----
Von: chatiman [mailto:chatiman at free.fr]
Gesendet: Dienstag, 24. Februar 2004 13:40
An: rrd-users at list.ee.ethz.ch
Betreff: [rrd-users] Newbie help


Hello,

I'm tryng to setup rrdtool for a data source which updates not often:
- updates occure at most 1 time per day
- updates occurs at least 1 time each 7 days 
- the data source represents the rank of a website
- average graph will be displayed for the last week, 
last month and last year 

So I 've used the following definition :

rrdcreate <path>
--start <timenow>
--step 86400
DS:rank:GAUGE:604800:0:U
RRA:AVERAGE:0.5:1:7
RRA:AVERAGE:0.5:7:4
RRA:AVERAGE:0.5:30:12

Does it seems correct ?

--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi

--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi