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Re: MLM question (limits)

To: nv-l@lists.tivoli.com
Subject: Re: MLM question (limits)
From: Art DeBuigny <debuigny@DALLAS.NET>
Date: Wed, 8 Sep 1999 14:40:23 -0500
Regarding the limits on the number of objects managed by the MLM, you should
also take into consideration the way that the NetView server keeps tracks of
MLM's and what nodes they should be managing.

NetView uses a collection of objects that correlate to a specific MLM.  If
you want to add items to an MLM's managed objects table, you redefine the
collection either by adding them from the map, or by defining some sort of
attribute comparison.

The downside of this is that even though the MLM's can handle loads of
devices, the server cannot handle large numbers of huge collections so
easily.  A significantly sized MLM implementation will require a larger
server to run it on.

Granted, much of your performance hit comes at daemon and GUI startup, but
in many environments those two items can be critical.

Just keep this in mind before you commit to hardware purchases for your
NetView system.

Art DeBuigny
Bank of America Network Operations
-----Original Message-----
From: Leslie Clark <lclark@US.IBM.COM>
Date: Wednesday, September 08, 1999 10:28 AM
Subject: Re: MLM question (limits)

>Like Netview, there are no architectural limits to what the MLM can
>support. It depends on your hardware and your network and your
>polling cycle.  Someone will correct me if I am wrong about this. That
>said, there were some benchmarks done that showed that the MLM ported
>to NT performed better than the Unix version which was originally
>designed for LAN use. The NT MLM has been benchmarked monitoring
>thousands of interfaces (in a lab environment, where network
>latency does not come into it).The Unix MLM is intended for hundreds.
>So probably you only need to worry about where you want the traffic and
>how many MLMs you want to be administering and how big a box you can
>And of course how much more that up/down status you are monitoring.
>I know this does not help much, but there it is.
>Leslie A. Clark
>IBM Global Services - Systems Mgmt & Networking
>What is the maximum number of devices that a MLM can support?
>Best Regards,
>Frank W. Hansen
>Tivoli Enterprise Certified Consultant
>Enterprise Innovations
>910 458 9172

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