NSCA problem

[Marc Powell]

> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> bounces at lists.sourceforge.net] On Behalf Of Giulio Botto
> Sent: Friday, February 15, 2008 9:54 AM
> To: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] NSCA problem
> 
> Marc Powell wrote:

> > This is all good. You don't have a lot of services at all. How
> > frequently are you sending results? On my own systems I'm easily
> > processing at least 13 results/sec. I know that there are others
doing
> > more but there is some point at which nagios can't keep up.
> 
> The problem we have seems to lay in the number of nsca daemons on
> the master machine.

The number would increase if the NSCA daemons were unable to write to
the external command pipe. That could be because the results are coming
in faster than nagios is processing them. The command pipe is only going
to hold about 4K of data then block until it's cleared.

> Also I do not understand why running nsca with the --single option
> only processes the first message it receives and discards the rest.

Nor do I. I run with -s and haven't experienced that problem. Running
nsca-2.1 here. Have you tried putting nsca into debug mode and
monitoring that? Running strace on the process would be informative as
well.

> > Are there other problems with the machine? Disk or memory issues? Do
you
> > have embedded perl or performance data processing enabled?
> 
> CPU and RAM seem ok up until something goes badly wrong and nagios
starts
> forking and allocating more memory, then swap.
> We have embedded perl and no data processing.

I did have a similar problem years ago on a machine with a failing disk.
The failures seemed harmless but ended up causing regular backlogs of
NSCA processes as you indicate. Fixing the disk problem resolved the
issue. That's why I asked.

--
Marc


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