[rrd-users] Re: 95th Percentile - Values stored inside RRD file

[Hwee Khoon, Neo]

Hi Serge,

I have 1 more question on the rrggraph.

I've create the rrd file using the below options:

	my @rrdoptions = (
		"-s 300",					#accept 1 value every 5 minutes

		"DS:ioct:COUNTER:600:0:U",	#input traffic datasource
		"DS:ooct:COUNTER:600:0:U",	#output traffic datasource
		"RRA:AVERAGE:0.5:1:28800"
	);


Inside my rrdgraph, I tried to print out the last value by using the
parameter:

		"AREA:inbits#00FF00:IN",
		"GPRINT:inbits:LAST:(Current In = %2.01lf %sb/s)",

I notice that long after I have stop polling the interface, the "Current In"
value is still a number (instead of nan).

Is this due to the fact that I did not create the rrd file with
"RRA:LAST...."? But would'nt the rrdgraph know that the last value is simply
the last value inside it's database?


Thanks.

HK




-----Original Message-----
From: rrd-users-bounce at list.ee.ethz.ch
[mailto:rrd-users-bounce at list.ee.ethz.ch]On Behalf Of Serge Maandag
Sent: Thursday, March 24, 2005 5:18 PM
To: Hwee Khoon, Neo; Rrd-Users
Subject: [rrd-users] Re: 95th Percentile - Values stored inside RRD file


> Thanks Serge, I've changed it to Counter type and I now see
> that the output of rrdfetch is in transfer rates.

O.k.!

> Basically the router is returning me the amount of bytes that
> has been transferred for every 300 seconds of SNMP poll.

Almost Correct. The counter is continuously increasing with every
byte that passes. So the difference betweeen your last poll and
the current poll is the amount of bytes that have passed in the
nterval.

> Because this value is cumulative, there will come a time
> where it's being resetted to 0 due to overflow.
> I'm curious if rrd is capable of detecting that the value has
> wrapped around and compute the value correctly.

Rrdtool automatically detects and corrects 32 and 64 bits counter
overflows. You don't have to specify anything. Just make sure you
don't have 2 counter overflows within your polling period.

You have that for instance when polling a 32 bits counter every 5
minutes for an interface that transports more than 114 Mps.

Serge.

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