[rrd-users] Detecting and handling unknown data

Steve Shipway s.shipway at auckland.ac.nz
Mon Aug 12 03:22:34 CEST 2013

The second issue, where AWrong:%c:strftime gives the epoch (IE, time 0) is
because the AVERAGE operator in a VDEF does not set the time component ¨C
after all, what should it set it to?  The MAX and MIN operators set the time
component to the time of the peak in question, but AVG doesn¡¯t have any
specific point in time, hence it is not set (or rather, it is set to zero).


For the first issue, I¡¯m not sure why this should be; you should be getting
¡®10¡¯ or ¡®0¡¯, if I read it correctly.  It might help to give more details
¨C the DEF statement, the rrdinfo for the RRD file in question, and the
version of RRDtool you¡¯re using.





Steve Shipway

ITS Unix Services Design Lead

University of Auckland, New Zealand

Floor 1, 58 Symonds Street, Auckland

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Email:  <mailto:s.shipway at auckland.ac.nz> s.shipway at auckland.ac.nz

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From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch
[mailto:rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] On
Behalf Of John huysing
Sent: Monday, 12 August 2013 12:53 p.m.
To: rrd-users at lists.oetiker.ch
Subject: [rrd-users] Detecting and handling unknown data


After look at the CDEF tutorial


and reading the section on handling unknown data

I thought I would try this to see if I could detect if had unknown data in a
rrd, so i could process it differently

If its unknown set the value to 10 else set to 0


PRINT:Wrong:%5.2lf            ----> returns inf
PRINT:AWrong:%5.2lf           ----> returns a value 
The 2nd problem is when I try this 
I always get the start of unix time ....1970 


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