graph data

[viper799]

ok to start with i love this package it took me a while to get my first custom graph working but i starting to get the hang of it.

my question is say I want to graph something like traffic on my eth0 port i have a perl script that returnes the traffic in this format

down:value up:value

but these numbers are totals and keep going up so are not the changed values sense the last script run. I can make a php script to store the last data set and do the math my self if I had to but there has got to me a way to get cacti to only graph the changes in the last value vs the current one I have not found out where to do this so anyone please help out.

I have several scripts that return this kind of data so this info would be helpful.

[BorisL]

Use 'Data Source Type' counter or derive

btw, why do you want to monitor network traffic using SNMP?

[viper799]

I run a site that uses up a lot of bandwidth I use a local perl script to return the data via Data Input Methods and graph it for my reference.

[BorisL]

it is an awkward method. bandwidth monitoring is natively supported via SNMP and cacti has ready-to-use teplates to plot all data using snmp as a source.