Hi All,
I have not been using rrdtool for too long, so this maybe unnecessary, if so
tell me know how I can do it with the existing operators.
I am trying to calculate availability for a device based on a true or false
value. The availability is a percentage 0 - 100%. The only way I can think of
to calculate it would be:
((Total # samples * (endtime - starttime)) - (# of false samples * (endtime -
starttime)) / (Total # samples * (endtime - starttime))) * 100
Example:
Ten samples every 5 minutes
Time Value Availability Function
--------- ----------- -------------- --------------
0 1 100%
((1*(0-0))-(0*(0-0))/(1*(0-0))*100 (Could be a problem here Div
by 0)
5 1 100% ((2*(5-0))-0/2*(5-0)*100 = 100
10 1 100%
15 1 100%
20 0 80% (5*20)-(1*20)/(5*20) = 80/100 =
.8 * 100 = 80%
25 1 83.3%
30 0 71.4%
35 0 62.5%
40 1 66.7%
45 1 70.0%
50 0 63.7%
Is there a way to do this in the current CDEF? If not I can add it to the list
of functions if you think this is the correct way to do something like this?
Or is there another way to make this happen within rrd?
Thanks in advance
Glenn MacGregor
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