[mrtg] Re: Number of SNMP elements per MRTG Box

[Perry, Duane]

 I have two server class Dell boxes with dual processors and SCSI drives,
they are polling about 5000 interfaces each.  I am using RRD but I am
starting to notice the response from the web server getting slower as I add
more interfaces.  I did some experiments today and if you build a config
file with just the Target lines it runs faster that calling all of the
individual cfg files.  I still use the small cfg files with 14all.cgi to
display the interfaces by box but use the big "Target" file for polling.  I
use Forks: 4 to speed things up and I started using  ::1:2 on the end of
each Target line to change the default SNMP timeout from 2 seconds to 1
second and the retries from 5 to 2.  I suspect that much of the polling time
is waiting for slow or dead boxes to respond.  I would guess that once your
polling takes longer than 5 minutes the processor would never catch up.

Duane Perry
University of Missouri

-----Original Message-----
From: Bryant Loftin
To: mrtg at list.ee.ethz.ch
Sent: 1/18/2002 1:52 PM
Subject: [mrtg] Re: Number of SNMP elements per MRTG Box


Hi Gene,
Using old style mrtg (non rdd) on win2k / P3-1.2Ghz I was polling:
twelve 26 port switches , ~312 ports and it was taking a little under
two
minutes.

I changes over to rrd and now the same sample is only taking around 35
seconds.

Between the before mentioned polling, MOM, SQL2k and polling other
devices
(over 3k in total) the box was very busy; like a good server should be.
I
converted to RRD and now you can barely feel the load.  I highly
recommend
using the RRD method, regardless I think you will be OK on an average
box;
P3-500 polling 500 objects total with the native MRTG .LOG method.

bjl


-----Original Message-----
From: Gene.Bagwell at VerizonWireless.com
[mailto:Gene.Bagwell at VerizonWireless.com]
Sent: Friday, January 18, 2002 8:45 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Number of SNMP elements per MRTG Box



Ok,

Here is a loaded question.

Approximately how many device can MRTG poll during 5 minutes if all the
devices are SNMP.

I have a network with over 500 serial interfaces (mixture DS-3, T-1, and
DS-0).  I am trying to determine I need one or many machines to poll the
network.

Thanks
Gene Bagwell, CCIE 2107
Dallas, Texas



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