[rrd-users] Re: create a RRD with the sum of other RRDs

[Warnes, Jason SktnHR]

You should be able to graph your VLAN traffic by creating a virtual data
source with CDEF.  For example, lets say that you have these RRD files:

port6.rrd (for port 6)
port7.rrd (for port 7)
port8.rrd (for port 8)
port9.rrd (for port 9)
port10.rrd (for port 10)
port11.rrd (and for port 11)

Your DEF's when graphing probably looks something like this (ignore the MAX
part, you may be using a different consolidation fuction):

DEF:port6_in=port6.rrd:in:MAX
DEF:port7_in=port7.rrd:in:MAX
DEF:port8_in=port8.rrd:in:MAX
DEF:port9_in=port9.rrd:in:MAX
DEF:port10_in=port10.rrd:in:MAX
DEF:port11_in=port11.rrd:in:MAX

Now what you can do is create a virtual data source which sums all the port
"in" stats like this:

CDEF:vlan1_in=port6_in,port7_in,+,port8_in,+,port9_in,+,port10_in,+,port11_i
n,+

Then just graph that CDEF and you're done.  The CDEF data source uses
Reverse Polish Notation (RPN) math, so that's why it may look a little
strange.

Hope this helps.

Jason...

-----Original Message-----
From: rrd-users-bounce at list.ee.ethz.ch
[mailto:rrd-users-bounce at list.ee.ethz.ch] On Behalf Of rrd at euskal-linux.org
Sent: Friday, September 24, 2004 10:43 AM
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] create a RRD with the sum of other RRDs


Hi!!!

 Well i hope i explain correctly.

 I have configured a switch with SNMP to get IN and OUT traffic port by 
port, so i have a RRD file with IN and OUT for each switch port (in this 
case 48 ports = 48 RRD files).

 Well, all this works OK.,.... but what i need is to see all the traffic 
of the VLANs.

 I explain......

 I have one VLAN called VLAN1 with the ports 6,7,8,9,10 and 11, so i 
want to create a RRD file with the traffic of that VLAN,   the sum of 
the traffic of ports 6,7,8,9,10 and 10.

 An example:

 traffic (in bytes):

  port  6 = 100
  port  7 = 200
  port  8 = 50
  port  9 = 300
  port 10 = 50
  port 11 = 100

 VLAN1 = 800

 How can i create (automatically or via perl script) a RRD file with the 
VLAN1 traffic???


 Thanks in advance.....



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