[rrd-users] Re: Fw: Re: PREV in 1.0.38 ?

Gonzalo Augusto Arana Tagle garana at uolsinectis.com.ar
Tue Oct 1 14:11:29 MEST 2002

Dear Stanley,

> I am writing to thank you for your letter and ask if you could perhaps
> spot the mistake or let me know what I am doing incorrectly ?

Sure (I'm not a rrdtool guru, but I'll do my best).

> tsitc> rrdtool -v
> RRDtool 1.0.39  Copyright 1997-2001 by Tobias Oetiker
> <tobi at oetiker.ch>


>         CDEF:prev_failures=failures,PREV
>         CDEF:prev_successes=successes,PREV

mmm... I think here's de problem,
Those two lines should be:

> [ERROR: RPN final stack size != 1]

That is reasonable:


  The PREV operator (do not confuse it with PREV()), fetches de previous
sample of prev_failures, rather than the previous sample of failures. 
So, at the end of the RPN expression you have two values on stack
(that's the error message you get).

Hope it helps,

Gonzalo A. Arana Tagle
Lider de Proyectos - Ingenieria

Florida 537 Piso 6, Buenos Aires, Argentina 
+54-11-4321-9110 ext 2543

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