[rrd-users] comparing to past samples

Alison L Greenwald alison at andrew.cmu.edu
Mon Nov 20 20:56:09 MET 2000

I am collecting data from an SNMP counter into an rrdtool database.
I'd like to be able to plot effectively the average number of
connections over time.  So, for example, if I get (at 5 minute
5, 10, 12, 20, 23
I want to plot the difference from the previous, value, i.e.:
<anything>, 5, 2, 8, 3 

If I store this data in a COUNTER datatype, all I get is the
percentage change over the previous value, which is not what I want.
I thought I could do this using PREV, but I can't see how...


woudl give me:
0, 10, 2, 18, 5
which is not really what I want.

I can't do

because I can't reassign b.

Is there anything I can do to get this to work?

Thanks in advance,

Andrew Systems Group
Carnegie Mellon University

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