[Top] [All Lists]

Re: [nv-l] SOLVED - Traps Limitation??

To: nv-l@lists.us.ibm.com
Subject: Re: [nv-l] SOLVED - Traps Limitation??
From: usman.taokeer@s-iii.com
Date: Sat, 15 Apr 2006 10:44:19 +0500
Cc: nv-l@lists.us.ibm.com, owner-nv-l@lists.us.ibm.com
Delivery-date: Sat, 15 Apr 2006 06:41:10 +0100
Envelope-to: nv-l-archive@lists.skills-1st.co.uk
In-reply-to: <OFFE3D35B2.098CF252-ON85257132.0065CB84-85257132.00661A93@us.ibm.com>
Reply-to: nv-l@lists.us.ibm.com
Sender: owner-nv-l@lists.us.ibm.com


I figured it out... the netview was flooded with traps, and it was preventing Netview (netmon) to work properl, now since we have limited the traps from devices everything is back to normal. There seems like a limitation in netview on number of traps that it can process, IBM should document it if there is one!

Usman Taokeer

James Shanks <jshanks@us.ibm.com>
Sent by: owner-nv-l@lists.us.ibm.com

15-03-06 11:35 PM
Please respond to

Re: [nv-l] Traps Limitation??

I doubt that you can ever solve this problem by merely guessing at probable
Stop guessing, turn on the full netmon trace (netmon -M -1), and call
They will be able to tell you what netmon is doing, or else pass the trace
to someone else who can.

James Shanks
Level 3 Support  for Tivoli NetView for UNIX and Windows
Tivoli Software / IBM Software Group

            Sent by:                                                   To
            owner-nv-l@lists.         nv-l@lists.us.ibm.com              
            us.ibm.com                                                 cc
            03/15/2006 09:47                                      Subject
            AM                        Re: [nv-l] Traps Limitation??      
            Please respond to                                            


Ok! here is the scenario:

NetView 7.1.4 FP04
Windows 2003 SP1
Hosted on a Dell Dual XEON Processor with 2GB RAM!

There are around 1200 Nodes discovered in the network, and we have around
400 Routers which are sending different traps to the Netview server. The
problem is whenever we try to "Demand Poll, Quick Test etc" any device it
just keeps saying "Waiting for netmon to respond" !!! Any clues what's
causing this? There is plenty of Memory available and the CPU utilization
is also between 4-10% only!


Usman Taokeer

Gareth Holl <gholl@us.ibm.com>                                            
Sent by: owner-nv-l@lists.us.ibm.com                                      
15-03-06 08:21 AM                                                      cc
          Please respond to                        Re: [nv-l] Traps      
        nv-l@lists.us.ibm.com                      Limitation??          

There is always going to be a limit of some sort, whether with the
hardware, OS, or trapd's ability itself. This is most likely dependent on
the resources (CPU speed, number of CPUs, and available memory per process)
available on the system hosting NetView.

trapd may end up consuming most, if not all cycles of a single CPU during
heavy trap reception. So a multi-CPU box would be essential so that other
processes could continue to run. High CPU utilization caused by trap floods
and even the subsequent processing of the traps by other daemons such as
nvcorrd could well affect netmon's ability to keep up if it cannot get the
CPU cycles it needs.

trapd will try caching/queuing all events received (with the goal to
eventually process every single one of them), hence the need for a large
amount of memory and an adequate queue size. The cached events will be
processed when there is a break in trap reception.....this could be some
time after the trap was originally generated. So while trapd is still
receiving traps, it is possible for NetView's internal events (including
those from netmon) to be caught up in this process and thus stayed
queued/unprocessed for some time. This probably isn't a direct affect on
netmon but instead more of a perceived affect as status events are not
processed in a timely fashion and thus nodes don't change color on the map
in a timely fashion

That's all I have.


Sent by: owner-nv-l@lists.us.ibm.com                                      
03/14/2006 09:57 PM                                   nv-l@lists.us.ibm.c
           Please respond to                                              
                  nv-l                                            Subject
                                                      [nv-l] Traps        

Hi List,

Just wanted to know are there any limitations On Netview on the number of
traps (coming from different nodes) it can handle? If there is any would it
effect the behaviour of netmon?



<Prev in Thread] Current Thread [Next in Thread>

Archive operated by Skills 1st Ltd

See also: The NetView Web