[rrd-users] Help on understanding RRA and DS

[Dexin Wang]

Hi Everyone,

I am new to RRD tool and I like it. Here I have some questions, please help.

A RRA is like a ring to which the data will be stored to those 
pre-allocated slots on the ring, right? So if I create a database with 
one datasource and 2 RRAs, that means I have 2 such rings that store 
data from that datasource, right?

What if I have multiple datasource and multiple RRAs? Do I have a ring 
for each of the datasource-RRA pair? For example:

rrdtoo create test.rrd --start XXX
     DS:ds1:COUNTER:60:U:U
     DS:ds2:COUNTER:60:U:U
     RRA:AVERAGE:0.5:1:60
     RRA:AVERAGE:0.5:60:24

Then I have 2x2 = 4 rings, which store the data from ds1 for 
1hour(60x60), 1day(60x60x24), and from ds2 for 1hour and 1day?

Please help me clarify this. Really appreciate your help!

Dexin

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