Hi Gareth,
I've previously submitted this question to the forum but would actually like
your advice on this. The thing I don't like about using SNMP in WUG is that
I have to setup a separate service to check the percent of free space on
each logical drive. The problem being that I have to go into WUG and make
changes any time we add/remove a drive. Is there a way that this can be
more dynamic (i.e. detect the logical disk instances and check them based on
what it finds for instances)? I don't think WUG itself has the capability,
but how about a script that WUG could check? Any ideas would be helpful.
Thanks,
Lori
-----Original Message-----
From: Gareth Williams [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, September 04, 2001 4:32 AM
To: '[EMAIL PROTECTED]'
Subject: RE: [WhatsUp Forum] Monitoring System Variables Using SNMP
Sorry for the delay in responding, I've been out of the office for a couple
of days. To find the OID you want, you need to find something that looks
reasonably named. For example, for Cisco kit bandwidth utilization, you need
to be looking at the if (interface) part of their mib tree. For NT server
CPU usage, look in the NT performance monitor tree and you should see
something that matches. Someone mentioned GetIf. Get hold of this tool, it
not only gives you the oid name, but also a description of what the object
is supposed to do.
Instances - You must know the instance for every device you want to monitor.
If you've got 2 logical disks, they will use the same OID but different
instance numbers to monitor specific disks. Again GetIf can help you here.
For each interface look at the interface number. This is also its instance
number for SNMP. For NT CPU usage, the instance number is 0. It doesn't
matter how many processors you've got, you only get the average usage! For
things like disks, you will find there is a logical disk instance entry
towards the top of the tree. Walk this oid and GetIf will list all the disk
letters with their instance numbers. You will find NT disk instances have
strange instance numbers, something like 48.58.48.59.67 To monitor a disk,
you append the instance number to the OID, so for a logical disk you get
something like 1.3.6.1.4.1.311.1.1.3.1.1.6.1.3.48.58.48.59.67
Finally, I strongly recommend you go to Somix www.somix.com and get an
evaluation copy of Denika. It comes with a set of and a copy of GetIf, so
graphing performance becomes quite simple.
Hope this helps
Gareth
-----Original Message-----
From: Strahan McCarten [mailto:[EMAIL PROTECTED]]
Sent: 31 August 2001 14:00
To: '[EMAIL PROTECTED]'
Subject: RE: [WhatsUp Forum] Monitoring System Variables Using SNMP
Gareth,
I've gotten that far - sorry - should have included that in the email. I
have some devices sending traps to WhatsUp as well. What I can't seem to
figure out is how to relate an OID to an actual THING. For example, what's
the OID for CPU utilization for a NT Server? What's the OID for the port
status on a Foundry Iron? What's the OID for bandwidth usage on a Cisco
router? And so on...
I used the Net Tools feature to browse through the MIB structure and found
logdskFreeMegabytes (aka 1.3.6.1.4.1.311.1.1.3.1.1.6.1.3), but I can't
actually get a value out of it. I also don't know what the Instance field
means...
Hope that clarifies my situation, and I hope you can help me!!
Thanks,
-----Original Message-----
From: Gareth Williams [mailto:[EMAIL PROTECTED]]
Sent: Friday, August 31, 2001 5:22 AM
To: '[EMAIL PROTECTED]'
Subject: RE: [WhatsUp Forum] Monitoring System Variables Using SNMP
What sort of system are you trying to monitor? There are 2 parts to SNMP.
You need some form of SNMP manager (in this case your WUG server), and the
client agent. The client agent sits on the machine you want to monitor and
is supplied by the manufacturer/software vendor. For example, for Windows NT
you need to install the SNMP service (found under networking) and then add
in the performance monitoring agent that makes all the counters used by the
NT performance monitor available through SNMP. For Cisco kit, you need to
enable SNMP monitoring on the router or switch. You can find a lot of
information at various web sites. Try www.somix.com for a start. You may
like to look at their performance trending tools ; Denika and WebNM. You
could also look at raw MRTG and possible RRDTOOL (go to www.mrtg.org for
more information). You could also try SNMP for the public community at
www.wtcs.org/snmp4tpc
Hope this helps get you started.
-----Original Message-----
From: Strahan McCarten [mailto:[EMAIL PROTECTED]]
Sent: 30 August 2001 22:02
To: '[EMAIL PROTECTED]'
Subject: [WhatsUp Forum] Monitoring System Variables Using SNMP
Afternoon,
I've seen and tried to follow the various messages passed along through this
list about monitoring disk space, CPU usage, etc, but I'm still not much
further ahead. I've downloaded and extracted the MIB files, but what next?
I've installed the SNMP Threshold monitoring tool, but I don't know what
Object ID to monitor. I've tried using Net Tools to troubleshoot the OID's
and see if I can even get a value out of it, but I can't.
I need some sort of middle step, because I'm lost.
Thanks,
Strahan McCarten
Systems Administrator
Homestore.com
[EMAIL PROTECTED]
direct 416-620-4610 x.1120
cellular 416-716-3943
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