perfsonar development work

[Jason Zurawski <>]

Ilias;

> > > I've been populating the rrd-ma via the Store functionality and I  
> > > ... can't find the data I stored.
> > > Just for testing purposes, i let a script send Storerequests with 
> > > the same data, for "current" timestamps , every 3 minutes all night. 
> > > Then I passed the key to a SetupDataRequest, and all I've got was 
> > > "0"... 
> >
> > If you were always sending the same data, the change in data over 
> > time would be 0, so it is behaving correctly :)
> You're probably right, but the thing is that I am supposed to be 
> sending bps - a data rate.


I am basing this answer on the RRD file here (perhaps you are using 
something different):

http://anonsvn.internet2.edu/svn/perfsonar/branches/new-structure/trunk/geant2_java-rrd-ma/samples/rrd/test.rrd

The DS values are specified as type COUNTER (use 'rrdtool info' to check 
it out), therefore they are expecting to see increasing values until 
overflow (like the actual SNMP values taken from ifInOctets for 
example).  If you are trying to store a data rate you should be using a 
different DS type such as GUAGE. 

It has been a very long time since I have examined this 'store' 
interface that everyone is talking about but if you are trying to send 
down data rates to be stored, and the RRD file is specified to accept 
counter values and *calculate* data rates from this base data, this will 
cause many problems internally.  Is this the case Roman/Loukik?

-jason

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Jason Zurawski, Network Software Engineer
Internet2

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