[rrd-users] Detecting and handling unknown data

[Steve Shipway]

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

 

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Steve Shipway

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University of Auckland, New Zealand

Floor 1, 58 Symonds Street, Auckland

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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

http://oss.oetiker.ch/rrdtool/tut/cdeftutorial.en.html

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

CDEF:wrong=currTot,UN,10,0,IF 


VDEF:Wrong=wrong,MAXIMUM
VDEF:AWrong=wrong,AVERAGE
PRINT:Wrong:%5.2lf            ----> returns inf
PRINT:AWrong:%5.2lf           ----> returns a value 
 
The 2nd problem is when I try this 
PRINT:AWrong:%c:strftime
I always get the start of unix time ....1970 
 

John

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