[rrd-users] Figuring out utilization

[Clarence]

I'm starting to realy confuse myself... Check this out... and correct me if im going in the wrong 
direction...

Senerio:
    I collect input & output octets stats from a network device every half hour.
    I want to be able to show utilization from the same rrd database that I draw my normal
    line graphs from..  This is what I do>

    for example:

                                            [ NETWORK DEVICE ]
        data at :  10:00am                        10:30am                    11:00am
                       34,000,000                    900,000,000                200,000,000         
                           
                           < the above is how many octets flew by during the last half hour>
                           < i think rrdtool stores the above value by dividing it by 1800(1 half-hour)>
                           < if that is true that i should do the following in order to get the utilization
                               as a percent for InOctets>

        34,000,000  --> should be stored as 18888.88            i.e  34,000,000 / 1800
        10,000,000  --> should equal 10mb  interface speed
        
OK now:
           =     ((1800*18888.88)  /  (( 10,000,000  /  8 ) * 1800 )  *  100  
           =     (  33,999,984      /   ( 1,250,000  * 1800  ))   *  100 
1.51%  =       ( 33,999,984      /        2,251,440,000 )    *    100


39.97% = ( 900,000,000 /                2,251,440,000)    *   100

8.88%    = ( 200,000,000     /          2,251,440,000)  *  100



Does the above look correct... or am I totally off base??


CoolC

     

Clarence Hart


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