On 27 October 2015 at 18:17, Donovan Baarda <a...@minkirri.apana.org.au> wrote: [...]
> This thread made me look at the RRD docs again and I discovered it now > supports DS's of type COMPUTE. That means it can already support > calculating value^2 as another DS, making it possible to do this; > > rrdtool create traffic.rrd \ > --start now --step 1m \ > DS:rate:COUNTER:2m:0:1000000 \ > DS:rate2:COMPUTE:rate,rate,* > RRA:AVERAGE:0.5:1m:8d \ > RRA:AVERAGE:0.5:1h:64d \ > RRA:AVERAGE:0.5:1d:2y \ > > and then get an approximate 95 percentile in your graphs by calculating > 2*stddev like this; > > DEF:rate=/home/rrdtool/data/traffic.rrd:rate:AVERAGE > DEF:rate2=/home/rrdtool/data/traffic.rrd:rate2:AVERAGE > CDEF:variance=rate2,rate,rate,*,- > CDEF:stddev=variance,SQRT > CDEF:95ptile=stddev,2.0,* > Doh! I forgot to add the average. That last line should be; CDEF:95ptile=rate,stddev,2.0,*,+ -- Donovan Baarda <a...@minkirri.apana.org.au>
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