[rrd-users] Re: Calculating percentages over time

[tallen at csc.sctboces.org]

On Wed, 30 Oct 2002, Alex van den Bogaerdt wrote:

> 
> On Wed, Oct 30, 2002 at 10:19:14AM -0500, tallen at csc.sctboces.org wrote:
> 
> > I'm graphing different subnets for billing purposes.  Using GPRINT, I can get 
> > AVERAGE bandwidth by subnet and in total, over the period of the graph, 
> > easy.  I can calculate the % used then by that subnet, again easy.  But if 
> > I do the percentages in the graph, the numbers get skewed, because it does 
> > an AVERAGE percentage, rather than a percentage of the averages.
> 
> First calculate the ratio (in a CDEF) then take the percentage?

The ratio is the percentage.

> 
> > In other 
> > words, if one subnet is active all night long, and no one else is on, that 
> > subnet gets billed for 100% usage for the entire night, irregardless of 
> > how much bandwidth they actually used.  I have a graph where 2 subnets 
> 
> That's right, because whatever amount of data they've sent, it will be
> 100% if they're the only one talking !?
> 
> Even if they used the amazing amount of just one byte, that single one
> byte is 100% of the total amount of bytes sent during that night.
> 
> So, if that's not your problem, what problem *do* you try to solve?

That is the problem.  I need to get the averages of total used and 
customer used, then do the math.  If I do it with a CDEF, the night-time 
traffic weighs in way to much.  I don't want to charge a customer for 100% 
of 14 mb/s if they use 1k/s, I just want to charge for 1k/s.  If you're 
saying I can get the averages over the span of the graph and do tne math 
with a CDEF, please tell me how.  Or in the alternative, can math be done 
in a GPRINT, or a simple perl script?

Thanks,

Tom



> 
> Alex
> 
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