Question #208167 on Graphite changed: https://answers.launchpad.net/graphite/+question/208167
Nicholas Leskiw proposed the following answer: I think that sending the correct value to Graphite in the first place is a much better solution. ;) Quenten Grasso <[email protected]> wrote: >Question #208167 on Graphite changed: >https://answers.launchpad.net/graphite/+question/208167 > > Status: Open => Answered > >Quenten Grasso proposed the following answer: >Hi > >I have this exact issue myself, I think I've solved it by using the >following, > >The Magical 0.125 I'm not sure were this comes from I've seen this >around a few places and had simular results as yourself, > >the scale has to be calculated on the sample time your doing > >Sample (divide by) timeinseconds x 8 (bits) = yourscale > >For example, > >I'm doing 3 second samples so I worked out my scale like this > >1 / 3 = 0.3333333333333333 * 8 = 2.666666666666667 > >Here is snapshot of one part of my url > >alias(scale(nonNegativeDerivative(s3_sw1.snmp.if_octets- >GigabitEthernet_0_1.rx),2.666666666666667),'RX') > >Also keep in mind you need to setup your whisper storage-schemas.conf as >well to expect your data every x seconds this is why I used the prefix >"s3_" eg, > >[real_time_3s_120days] >pattern = s3.* >retentions = 3s:120d > >Hope this helps :) > >Regards, >Quenten > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf >Of David Michael Pennington >Sent: Monday, 10 September 2012 9:01 PM >To: [email protected] >Subject: [Graphite-dev] [Question #208167]: Graphite SNMP Counter transforms > >New question #208167 on Graphite: >https://answers.launchpad.net/graphite/+question/208167 > >I'm using graphite version 0.9.10 to read ifHCInOctets and >ifHCOutOctets, which I'm polling with the collectd snmp and >graphite_write plugins; I'm using collectd version 5.1.0. > >Data arrives into graphite with no problems; however, I want to graph as >bits-per-second. To test whether my stats are correct, I started a CD >iso download and watched the download rate... it varied between 1.0Mbps >and 2.0Mbps. > >Common-sense tells you that you need to multiply Octets counters by 8 to >get bits; however, it seems that I need to divide by 8 to make graphite >display correctly. > >When I multiply by a 0.125 scale factor, >"scale(scaleToSeconds(nonNegativeDerivative(<SERIES>), 60),0.125), the >formula correctly converts to bits-per-second and I see numbers between >1Mpbs and 2Mbps... > >When I use a scale-factor of 8, it fails spectacularly; I get readings >of 120Mbps, but I know that's impossible because my circuit is capped at >5Mpbs. > >I posted the gory-details (including config files and graph snapshots) here: >http://serverfault.com/questions/425828/graphite-snmp-counter-transforms > >Could someone me understand the math such that scale(<series>, 8) fails? > >-- >You received this question notification because you are a member of >graphite-dev, which is an answer contact for Graphite. > >_______________________________________________ >Mailing list: https://launchpad.net/~graphite-dev >Post to : [email protected] >Unsubscribe : https://launchpad.net/~graphite-dev >More help : https://help.launchpad.net/ListHelp > >You received this question notification because you are a member of >graphite-dev, which is an answer contact for Graphite. > >_______________________________________________ >Mailing list: https://launchpad.net/~graphite-dev >Post to : [email protected] >Unsubscribe : https://launchpad.net/~graphite-dev >More help : https://help.launchpad.net/ListHelp -- You received this question notification because you are a member of graphite-dev, which is an answer contact for Graphite. _______________________________________________ Mailing list: https://launchpad.net/~graphite-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~graphite-dev More help : https://help.launchpad.net/ListHelp
