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5072 Views 1 Reply Latest reply: Jul 30, 2009 12:49 PM by Shane Scott RSS
Shane Scott ZenossMaster
Shane Scott
1,373 posts since
Jul 6, 2009
Currently Being Moderated

Jul 30, 2009 9:17 AM

Read previous to last entry in RRD

Hey all:

I'm trying to figure out how to read the previous to last entry recorded by RRD. The reason is that a Juniper device in my possession only provides total counters for file hits.

Ex:

Minute 1/sample 1 - Previous to Last total = 4750 hits
Minute 2/sample 2 - Last Total=5000 hits

5000 - 4750 = 250 hits per minute

250 / 60sec per min = 4.16 per second

Thanks everyone!
  • Shane Scott ZenossMaster
    Shane Scott
    1,373 posts since
    Jul 6, 2009
    Currently Being Moderated
    1. Jul 30, 2009 12:49 PM (in response to Shane Scott)
    RE: Read previous to last entry in RRD
    I figured this out. Incase anyone else needs to know, its done by the following code in custom graph definition:

    Code Begin [
    CDEF:CurrentIveNCHits=iveNCHits-raw
    CDEF:LastIveNCHits=PREV(CurrentIveNCHits)
    CDEF:PrevIveNCHits=PREV(LastIveNCHits)
    CDEF:DiffIveNCHits=CurrentIveNCHits,PrevIveNCHits,-,0.001,+
    ] End

    This results in the difference between the two samples (this last and the previous) and adds 0.001 to avoid a negative 0.00 (unknown why it happens).

    This is useful for taking a counter total and determining the count per second, etc.

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