Defining the right RRA Settings is essential if you are customizing how your graph will be displayed. RRAs were set by Steps, Rows and Timespan. These will determine how you keep your data in different intervals and how long would you keep that interval. Manipulating these intervals would require some storage space, the longer you keep the data at a very small interval, the larger space it will require on your storage drive. So proper RRA settings would help you maximize your storage capacity without sacrificing longer period of significant data.
Hourly (1 Minute Average)
Steps – are the number of data points needed to place the data in RRA, (keep in mind that my system is polling every minute)so my value is “1”. This means that every minute, the data will be reflected on my graph, but for how long? the answer will be the number of Rows. My value for rows is 10080, this is equivalent to 7 days of 1-minute data.
To get this,
{[10080/(60/1 step)]/24 hours} = 7 days
{[10080/60]/24} = 7 days
Then, what would be my Timespan to display this graph? Timespan value is in seconds, I want to see my 1 minute graph in the last 6 hours, so my value would be 21600 sec = 6 hours
Daily (5 Minute Average)
Steps = 5, This means that the data will be reflected every 5 steps, (which is also equivalent to 5 minutes)
