Cacti Primer, RRA definitions

RRAs are defined for step (minutes between samples), rows (how many minutes of data to store), and timespan (how wide the graph for that RRA should be).
Cacti does not support updates of less than 1mn but rrdtool does => requires direct rrdtool update from cron instead of the cacti update job.

RRAs are defined for step (minutes between samples), rows (how many minutes of data to store), and timespan (how wide the graph for that RRA should be).