> I have been using rrdtool for years and being very pleased with the > tool, except for one problem I never get to solve. > > I have rrd to count occurences of viruses arriving to my mailbox, but > I never found the right type of data and always end-up with half a > virus arriving into 2 consecudtive heartbeat, > > It would look much better to have one virus arriving at time t rather > than having half virus a time t and half a virus at time t-1.
You are referring to the frequently-cursed Data Normalisation. The way to avoid this is to always submit the data on the time window boundary. Thus: for the data arriving at time t (in UNIX time format) into an RRD file with data step s, submit it to RRDTool at time (t-(t mod s)), IE at the last time step boundary prior to t, rather than using 'N'. EG, if s=100, then t=1234567890 will be submitted for time 1234567800 and so on. This will render the data normalisation function a null operation. Steve Steve Shipway ITS Unix Services Design Lead University of Auckland, New Zealand Floor 1, 58 Symonds Street, Auckland Phone: +64 (0)9 3737599 ext 86487 DDI: +64 (0)9 924 6487 Mobile: +64 (0)21 753 189 Email: [email protected] Please consider the environment before printing this e-mail : 打印本邮件，将减少一棵树存活的机会
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