Re: [nv-l] Traps Limitation??

[James Shanks <jshanks@us.ibm.com>]

Usman,
I doubt that you can ever solve this problem by merely guessing at probable
causes.
Stop guessing, turn on the full netmon trace (netmon -M -1), and call
Support.
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


                                                                           
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Gareth,

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!


Regards,

Usman Taokeer
Si3.

                                                                           
 Gareth Holl <gholl@us.ibm.com>                                            
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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.

Gareth



                                                                           
 usman.taokeer@s-iii.com                                                   
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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?

Regards,

Usman
Si3.