RES: [Nagiosplug-help] NSClient fix needed

[Sandro Vaz]

I´m having the exact same problems (and others), using 1.7.0.1 client.

I don´t know if in dual processors hosts, some counters don´t report
correctly. It´s really strange, because even when 2 hosts have same client,
one host report consistent with PerfMon, and the other completely different.

One of the most problematic counters for me is: \\process(<process_name>)\%
Processor Time". Paging file also goes bad around here in various machines.

And other strange problem is a "Out of Memory" EventLog entry, around 15
hours of starting NetSaint NT Agent, when trying to get Exchange queues.
After that time, NSClient reports "Mal formed request or internal error".

Tomorrow I will try a NSClient "downgrade" to see what happens.

I´m copying Mr. NSClient to see if he can help.

Att.,

Sandro Vaz

-----Mensagem original-----
De: nagiosplug-help-admin at lists.sourceforge.net
[mailto:nagiosplug-help-admin at lists.sourceforge.net] Em nome de Voon, Ton
Enviada em: segunda-feira, 31 de março de 2003 05:54
Para: 'Tim Shouldice'; nagiosplug-help at lists.sourceforge.net
Assunto: RE: [Nagiosplug-help] NSClient fix needed


Tim,

Thanks for the report. Unfortunately, the nagiosplug project does not
maintain NSClient (though we will accept patches to check_nt) - you may want
to try http://nsclient.ready2run.nl/.

Ton

> -----Original Message-----
> From:	Tim Shouldice [SMTP:tim at mintoskatingclub.com]
> Sent:	Saturday, March 29, 2003 5:52 AM
> To:	nagiosplug-help at lists.sourceforge.net
> Subject:	[Nagiosplug-help] NSClient fix needed
> 
> I often been perplexed by the results returned by the NSClient for 
> some of the counters. Some, like \\Processor(_Total)\\% Processor Time 
> <file://\\Processor(_Total)\\% Processor Time> were returning 99 all 
> the time, others returned 0 all the time, others returned data that 
> was not consistent with the output from the Perfmon tools (same 
> trends, different values, same host). While others worked perfectly 
> fine! Additionally, the internal code called the same counter and 
> seemed to be getting results.
>  
> After a review of the source code and review of Microsoft's 
> documentation on the PDH api, it seems that some of the counters 
> require two samples to report correct data. There are two separate 
> functions - PdhGetRawCounterValue (which is raw, unformatted and 
> uncalculated) and the more useful PdhGetFormattedCounterValue (which 
> calculates formatted value and somtimes needs two data points to do it 
> - eg. functions with percentages of usage and rates per second). The 
> source code within NSClient uses PdhGetFormattedCounterValue as 
> follows:
>  
> uNSClient.pas
> 
> // Collect the data
> 
> PdhCheck('Collect ' + sCounter, PdhCollectQueryData(qryPDHQuery));
> 
> // Process Custom counter
> 
> PdhCheck(sCounter, PdhGetFormattedCounterValue(custom_counter,
> PDH_FMT_DOUBLE, nil, CounterValue));
> 
> ...
> 
> However, in both the documentation, and in samples on MSDN, it is 
> clear that two calls to PdhCollectQueryData with a sleep between are 
> required. Here is an excerpt from Microsoft's sample code (in c):
> 
> // "Prime" counters that need two values to display a 
> //   formatted value.
> pdhStatus = PdhCollectQueryData (hQuery);
> 
> // Wait one interval.
> Sleep(SAMPLE_INTERVAL_MS);
> 
> // Get the current data values.
> pdhStatus = PdhCollectQueryData (hQuery);
> 
> SAMPLE_INTERVAL_MS was a constant defined as 1000.
> 
> I compiled and tested the samples and found when I used the query, 
> wait, query method that my counters returned correctly, however if I 
> commeneted out the 'prime counter' query and the sleep, then the 
> results were the same funny ones I get with NSClient.
> 
> It seems the following two lines need to be added to NSClient
> 
> >PdhCheck('Collect ' + sCounter, PdhCollectQueryData(qryPDHQuery));
> 
> sleep(1000);
> 
> PdhCheck('Collect ' + sCounter, PdhCollectQueryData(qryPDHQuery));
> 
> >// Process Custom counter
> 
> >PdhCheck(sCounter, PdhGetFormattedCounterValue(custom_counter,
> PDH_FMT_DOUBLE, nil, CounterValue));
> 
> I do not have access to a Dephi environment to add these lines and 
> recompile, is there anyone who can and then post the updated 
> executable?
> 
> Additionally, it is not well documented but a review of the source 
> code demonstrates that the counters.defs file is purely used for some 
> of internal data collection for commands other than COUNTER, adding 
> additional counters to this file is not required and they would not 
> even be used. The file is used to compensate for the good folks at 
> Microsoft changing the CPU usage counter between NT and Win2k and to 
> enable the application to work with different language versions of the 
> OS. The custom counter function does not use this file or the language 
> definitions because it is the counter name itself that changes between 
> language versions of the OS. Early programs that gathered counter 
> information directly from the registry needed the language version 
> because the counter values are stored under a registry key linked to 
> the language. This not apply when using the PDH libraries.
> 
> Cheers,
> 
> Tim Shouldice
> 


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