[drraw-users] Begginer question: how to combine two rrd files?

[Tony T.]

>
>  I don't off-the-bat see how this is a problem.
>
> You are going to select each file and add it as a datasource.  Once you do
> this, you will see a list of DS's in the Data Source Configuration section.
> Find the 2 relevant ones and note the name in the second column.  It will be
> a letter.
>
> Click the Del box for any data sources that are not relevant to your
> graph.
>
>
> Go to the RRA/CDEF.  On either one of the datasources, you will put in the
> empty box something like the follow.  Assume the names of each of your 2
> datasources are "a" and "d".
>
> a,d,+
>
> This should do the trick.
>
>


Thanks for that,  what was throwing me off is I have not seen it documented
anywhere on which area this should be put; I was trying the  File RE:. DS:
and Element and Formula dialogs and all of those produced some strange
results.


 The other guy who just replied to this is right--you need to familiarize
> yourself more with how rrdtool works.  drraw is a great tool for helping you
> design graphs, but you do need some rudimentary knowledge of rrdtool to
> really use for more than the most basic tasks.
>


Thanks again, I am reading up on the rrdtool site and trying to understand
all this RPN stuff...I am sure there must be a logical reason for what looks
to me like a very odd way to handle logic.  :)

T.


  Tanya Ruttenberg - RSIS Contractor
> OTSO/DNE/NMPEB
> tanya.ruttenberg at ssa.gov
>
>
>
>  ------------------------------
> *From:* drraw-users-bounces at taranis.org [mailto:
> drraw-users-bounces at taranis.org] *On Behalf Of *Tony T.
> *Sent:* Tuesday, October 03, 2006 11:37 AM
> *To:* drraw-users at taranis.org
> *Subject:* [drraw-users] Begginer question: how to combine two rrd files?
>
>
>  Hi all,
>
> I am using Drraw 2.1.3 to create graphs from data that is collected for
> Orca use on Solaris systems. Orca is good at it's own graphs but sometimes
> its nice to get on the fly output as well. Usually I can get simple graphs
> but I am at the point now where I need to do some math on the RRDs.
>
> I have not been succesful in combining output from RRD files to give me a
> SUM, i.e. one RRD is cpu_usr, the other is cpu_system.  To get the total
> utilization I need to add these two together but I can't figure out how to
> do it.  Everything I have tried in the CDEF sections has failed, probably
> because I am at a loss as to what needs to go where.
>
> Can anyone help me?
>
> Thanks.
>
>


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