[rrd-users] Re: Understanding Questions

[Alex van den Bogaerdt]

Markus.Forrer at coop.ch wrote:

> I want to monitor a 1 Gigabit Link. For this I set the intervall to 30s.
> 
> ./rrdtool create ../test/bdfalk_8004.rrd --step 30

step==30 --> each PDP is 30 seconds. RRDtool will work with intervals
of 30 seconds.

> 	DS:input:COUNTER:600:U:U 
> 	DS:output:COUNTER:600:U:U 

heartbeat==600 --> updates should not be further apart than 600 seconds.
(you may want to lower this value, to 70 or so)

> 	RRA:AVERAGE:0.5:1:6000 

1 PDP per CDP, 6000 CDPs

> 	RRA:AVERAGE:0.5:60:700 

60 PDPs per CDP, 700 CDPs

> 	RRA:AVERAGE:0.5:240:775 

240 PDPs per CDP, 775 CDPs

> 	RRA:AVERAGE:0.5:720:797 

720 PDPs per CDP, 797 CDPs

> 	RRA:MAX:0.5:1:6000 
> 	RRA:MAX:0.5:60:700 
> 	RRA:MAX:0.5:240:775 
> 	RRA:MAX:0.5:720:797

dito.

Now I'll do one calculation, you do the rest:

240 PDPs per CDP, 775 CDPs.
Each PDP is 30 seconds, there are 240 PDPs in each CDP so that
is a total of 30 seconds * 240 PDPs == 7200 seconds per CDP.
This can also be written as 2 hours per CDP.
There are 775 CDPs, this is 775*2==1550 hours. This is 64 days
and 14 hours.
So, the 3rd and 7th RRA store 64 days and 14 hours each.

cheers,
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