Re: [opennms-devel] OpenNMS, Meet WMI

[Matt R. <mat...@gm...>]

Craig,

I have been using a user that has local administrator access for testing but
mhuot and I proved you could do it without. The challenge is that you have
to grant your non-administrator user access that's beyond that of a simple
group membership. I think you could probably push this access out through a
group policy, but lets cut to the chase:
http://www.j-interop.org/quickstart.html

There's a section in there about what to do if granting administrator is a
concern.

As far as your second question, about performance, is concerned I cannot say
that I have compared the two closely but I can say that my gut says that WMI
is faster. WMI doesn't have an additional layer of abstraction that NSClient
has but I cannot speak to the other agents (OpMon and NSClient++).

Important note: some WMI items will be slower than others because they are
generated on-demand. A clear example of this is if you were to use
Win32_LogicalDisk to view the A: drive - you will hear your floppy drive
attempt to read. If you have a floppy disk in it is slow to retrieve the
values. If you do not have a floppy disk in it's *painfully* slow to return
the values.

That being said the Win32_Perf* classes don't suffer from this (this is the
tree of classes that cover the same functionality as PerfMon.)

I hope this answers your questions.

On Wed, Oct 29, 2008 at 2:11 PM, Miskell, Craig <
Cra...@ag...> wrote:

>
> > WMI has finally come to OpenNMS.
> WOOT+1
>
> > Finally you will have to edit wmi-config.xml - this file
> > mimicks the way snmp-config.xml works, you can do ranges of
> > IPs, a specific IP or defaults. To get going the easy way
> > edit the username, password and domain to fit that of your
> > environment. If you don't want to give your system access to
> > your whole domain you can specific a local user on a system
> > by setting the domain to the name of the system.
> Just out of curiosity: what level of privilege do those credentials
> require?  Administrator on the server?  Just a user?
>
> Also:  are you in a position to comment on the efficiency of this WMI vs
> the NSClient protocol?  I understand WMI can get at perfmon counters, which
> is what I use NSClient for at the moment.  Not having to install the
> NSClient client (that's really weird to type and worse to read) on each
> server would be great; it'd be even better to not take 1second per data item
> (the NSClient client code takes two samples 1 second apart before returning,
> hence the fairly large default "timeout" for NSClient).
>
> Ta,
> Craig Miskell
>
>
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-- 
Matt Raykowski
/s