[rrd-users] Re: Calculating traffic
Alex van den Bogaerdt
alex at ergens.op.HET.NET
Wed Jun 26 13:00:44 MEST 2002
> Now i am more confused...... :-(
> > CDP calculation:
> > 0.5 times the amount of PDPs needed per CDP may be unknown. The RRAs
> > need 1,6,24 and 288 PDPs per CDP. The RRA stores 600,700,775,3725 of
> > these CDPs.
> >
> > Total time per RRA:
> > The total time per RRA is the time per PDP (your --step time) multiplied
> > with the amount of PDPs per CDP (steps) multiplied by the amount of CDPs.
> > The numbers are:
> > 60*1*600 == 36000 seconds == 10 hours
> > 60*6*700 == 252000 seconds == 70 hours = 2 days 22 hours
> > 60*24*775 == 1116000 seconds == 12 days 22 hours
> > 60*288*3725 == 64368000 seconds == 745 days
>
> What does this mean????
What is it you don't understand? I specifically wrote how to do
this calculation.
As a formula:
total_time = time_per_PDP * amount_of_PDPs_per_CDP * amount_of_CDPs
> i thought that with 3725 i will have a five years rrd file.....
There's *no* way I can come up with this number so explain. While
you're doing that maybe we can see where you go wrong.
For 5 years worth of data:
5 years would be 5 * 365 days + two extra = 1827 days. (The two extra
days are for february 29th).
1827 days * 86400 seconds per day = 157852800 seconds.
The amount of steps in the last PDP is 288.
The amount of time per PDP is 60
So:
total_time = time_per_PDP * amount_of_PDPs_per_CDP * amount_of_CDPs
157852800 = 60 * 288 * amount_of_CDPs
157852800 = 17280 * amount_of_CDPs
157852800/17280 = amount_of_CDPs
amount_of_CDPs = 9135
--
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