[rrd-users] setting correct RRA step,rows

[raptor]

hi,

I would like to ask is my calculations correct.. what I want is to display as much as better graphics..
so here goes.. with the deafult rrdgraph-image-with I have 400px usable area for plotting the
data. Now with this in mind I have to calculate the correct "steps" in RRA.
/cdp-interval is 5 min = 300sec, time is  interval for which i need graphics/


(time/cdp-interval) * steps = image-useble-width

steps = (time/cdp-interval)/image-useble-witdh
steps = time/(cdp-interval * image-useble-witdh)

steps = time/(300 * 400)
steps = time/120 000

Now if I want to calculate this for day(86400 sec), week (604800), month (18748800), year (31536000)
steps = 86400/120 000 = 0.72 => 1
steps = 604800/120 000 = 5.04 => 5
steps = 18748800/120 000 = 156.24 => 156
steps = 31536000/120 000 = 262.8 => 263

so my  rrdcreate should be :

"RRA:AVERAGE:0.5:1:400",   #day, it can be 288 instead 400
"RRA:AVERAGE:0.5:5:400",   #week
"RRA:AVERAGE:0.5:156:400",   #month
"RRA:AVERAGE:0.5:263:400",   #year


Is my calculations correct... !!!!

If they are correct put them in some how-to :")

tia

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