> > The problem moose has is that he is plotting the data counter, not a > > rate derived from it. > > > I did not understand you, Could you tell me what to do?
The SNMP traffic you are storing is a continuously increasing counter of the data transmitted; however, you are interested in the RATE (IE, bytes per second). RRD files have various data types -- gauge, absolute, counter, derive etc. You have defined your RRD with the wrong data type for your DS. Say you retrieve value v0 at time t0, and value v1 at time t1. GAUGE : this is for something you want to plot as-is; eg, the temperature of your device. At time t1, you store v1. COUNTER : this is for a constantly increasing value where you are interested in the RATE of change. At time t1, you store ([v1 - v0]/[t1 - t0]). I believe it also takes account of 16bit and 64bit counter wrapping. This is the one you want in this case. DERIVE : This is like COUNTER, except that it allows the value to decrease (IE, a negative rate) ABSOLUTE : This is like COUNTER except that it assumes the value is reset on reading; IE you store (v1/[t1 - t0]) Hope this makes more sense. 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: s.ship...@auckland.ac.nz Please consider the environment before printing this e-mail
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