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

[Ruttenberg, Tanya]

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.
 
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.
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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