[rrd-users] Re: Graphing Total Bandwidth

[Serge Maandag]

Well, here's any pointer:

Your database has a couple of RRA's defined. Each RRA is made up of consolidated data points (CDP's).
The CDP's are built by averaging multiple Primary Data Points (PDP's).

Therefore a PDP spans a certain amount of time.

If the step size is 300 seconds and your second RRA is defined as: RRA:AVERAGE:0.5:6:288
the the timespan covered by each PDP is 6 x 300 = 1800 seconds or half an hour.

If you'd make a CDEF bytes=bps,1800,* and graph that, the bars would show the amount of data that went through each half hour.
Now that's not what your looking for. You are looking for 1 hour wide bars. 

To accomplish that, you could make a database with other RRA's. one that holds 1 hour values for a day, 24 hour values for a month, etc. You probably also could do sophisticated stuff with the new version of rrdtool by making cdef's with the prev and time functions, but I never fiddled with those, so you are on your own.

Serge.


-----Original Message-----
From: Andre Miller [mailto:andre.miller at blueriver.co.za]
Sent: Wednesday, April 30, 2003 9:53 PM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] Graphing Total Bandwidth


Hi,
 

I've tried to find an answer to this question by searching the archive - but
have not been able to locate a suitable answer, sorry if its been answered
before and I missed it.

 

Currently I am collecting interface data (in octets, out octets) every 5
minutes and are graphing it showing average throughput (in bytes/second).

 

I want an additional graph showing bandwidth usage, in bytes, doesn't really
matter. I have not been able to get this right.

 

To explain a bit better, what I want is three different graphs:

 

Daily: X axis: one point/bar per hour, Y axis: Total amount of bytes
transferred in that hour.

Monthly: X axis, one point/bar per day, Y axis: Total amount of bytes
transferred in that day.

Yearly: X axis, one point/bar per month, Y axis, Total amount of bytes
transferred in that month.

 

So for example, on the daily graph, if between 13:00 and 14:00, 5 megabytes
was transferred, the bar will show 5mb for that point.

 

Any help / pointers would be appreciated. I've heard that anything is
possible with rrdtool - so I must be able to do this =).

 

-

Andre' Miller

 


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