[rrd-users] Re: What can this be ?

[Gary Pavlik]

Daniel,
	It sounds like one of two problems:
1) interpolation - rrdtool is adjusting for not being exactly on time...rrd
works well with moving targets, it expects moving targets, it wants moving
targets...If this is the case replace N with some time stamp and just force
the issue.

2)  scaling - When you go to graph the data is the data being displayed as a
power of 2 or a power of 10?  I have seen this same problem on the cricket
mailing list.

Hope this helps,
Gary.


-----Original Message-----
From: Daniel.Kurucz at varetis.de [mailto:Daniel.Kurucz at varetis.de]
Sent: Friday, December 01, 2000 7:29 AM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] What can this be ?



Hi all,

I use RRD to monitor some servers here in the company. I'm a bit confused,
because the CPU load data gets correctly in the RRD Database, but either it
is transformed while updating the database, or while creating the graph.
Here, how it worx :

<PROBLEM>
Getting load data with the uptime command, which sends me following result
:
02:11PM   up 129 days,   4:19,  31 users,  load average: 11.96, 8.97, 7.90

Now, i convert it to "rrd-readable" format this way :
uptime | awk -F "load average:" '{print $2}' | awk -F "," '{print "N:"
substr($1, 2) ":" substr($2, 2) ":" substr($3, 2)}'

This will result :
N:11.96:8.97:7.90
This means the load of the last 5, 10 and 15 minutes

Now let's update the database, and create the graphs, where i use GPRINT-s
with the LAST argument too.
In my graph i become following data :
5-min load avg : 12.01  10-min load avg : 8.90   15-min load avg : 7.93
But it has to be :
5-min load avg : 11.96  10-min load avg : 8.97   15-min load avg : 7.90
</PROBLEM>

Sometimes it worx fine, but 50% of the data in the graph is malformed, like
thus above.

The problem is not that big, but the question is : WHY ?

Thanx in advance :
---------------------------------------------------------------------
Daniel Kurucz
varetis Communications GmbH
Tel : +49-89-45566-487
Fax : +49-89-45566-158


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