[rrd-users] Re: Calculating traffic

[Iñaki Martínez]

Kaixo Alex van den Bogaerdt!!!

 First of all..... THANK YOU VERY MUCH for your help!!!!!


> >  What does this mean????
> 
> What is it you don't understand?  I specifically wrote how to do
> this calculation.

 I thought i understand in some way how rrd file works, but i did not 
understand at all.  


> As a formula:
> total_time = time_per_PDP * amount_of_PDPs_per_CDP * amount_of_CDPs

 OK..... a write down....
 
> >  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.

 Taken from rrdtool tutorial......
 600 samples of 5 minutes  (2 days and 2 hours)
 700 samples of 30 minutes (2 days and 2 hours, plus 12.5 days)
 775 samples of 2 hours    (above + 50 days)
 797 samples of 1 day      (above + 732 days, rounded up to 797)


 With this formula:

 2261 = 2 + 12 + 50 + 1 + (732 * 3) for three years
 
 
> 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

 To clear:

 time_per_PDP           = --step value
 amount_of_PDPs_per_CDP = steps (RRA)
 amount_of_CDPs         = rows (RRA)

 this are OK????

 then from the above example (tutorial):

 60 * 288 * 797 = 13772160 segs =~ 159 days

 but in the tutorial says 732 days

 I am confused.......

 Then..... 
 must i change 3725 for 9135.... ?????
 must i change all???


Well, i have the following:

  rrdtool create port_xxx.rdd --step 60 \
  DS:in:COUNTER:600:U:U                 \
  DS:out:COUNTER:600:U:U                \
  RRA:AVERAGE:0.5:1:600                 \
  RRA:AVERAGE:0.5:6:700                 \
  RRA:AVERAGE:0.5:24:775                \
  RRA:AVERAGE:0.5:288:3725              \
  RRA:MAX:0.5:1:1:600                   \
  RRA:MAX:0.5:6:700                     \
  RRA:MAX:0.5:24:775                    \
  RRA:MAX:0.5:288:3725;


what do you change to:

 1) have a five years of data
 2) make a graph of two hours and see smooth
 3) make a graph of a year of 2,3,4 or 5 years ago


 Well i think that for now if enough!!!!


 THANK YOU for your help!!!


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