[rrd-users] Re: TIME & rpn

[Alex van den Bogaerdt]

Iain Buchanan wrote:
> I thought to print this 'dot graph' I
> might use the following CDEF:
> 
> DEF:d2=test.rrd:d2:MAX
> CDEF:max0=d2,POP,TIME,1006000000,EQ,d2,UNKN,IF

stack becomes:

   d2
   <empty>
   time-of-d2
   time-of-d2,1006000000
   <1 or 0>
   <1 or 0>,d2,unkn
   <either d2 or unkn>

The result is either the interval ending at 1006000000 or
the unknown value.  If no interval ends at 1006000000, you
will always get unknown.

> and then via a loop:
> CDEF:max1=d2,POP,TIME,1006000100,EQ,d2,UNKN,IF
> CDEF:max2=d2,POP,TIME,1006000200,EQ,d2,UNKN,IF
> etc...

Dito for the other times.

Now, you obviously think you have a time series that is
100 seconds (or 2,4,5,10,20,25 or 50) apart.  Even if your
RRA has this property it could very well be that consolidating
the data alters this at graph time.  See http://faq.mrtg.org/
more specifically the "intro" and "more" entries.

As a side note: if you don't need the values separated, some
magic involving TIME and % (modulo) might be appropriate.

cheers,
-- 
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