[rrd-users] Re: Merging two RRDs

[Alex van den Bogaerdt]

On Mon, Aug 09, 2004 at 11:34:27AM +1000, Euan Buchanan wrote:

> Whilst I'm not losing any data, it does make viewing the data a little
> inconvenient.  Is there a way I can populate one rrd with the values
> from the other rrd?  Filling in the gaps as it were.

If the problem is viewing, why not solve it in "rrdtool graph" ?

  DEF:s1=/path/to/rrdfile:serial1:AVERAGE
  DEF:s2=/path/to/rrdfile:serial2:AVERAGE
  CDEF:serial=s1,UN,s2,s1,IF

In other words:  get the two data sources, select the 2nd one if
the 1st one has unknown data.

Perhaps slightly better:

  DEF:s1=/path/to/rrdfile:serial1:AVERAGE
  DEF:s2=/path/to/rrdfile:serial2:AVERAGE
  CDEF:serial=s1,UN,s2,s2,UN,0,s2,IF,s1,+,IF

which will also catch the case where a switchover occurs and thus both
CDPs have known data.

Alex
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