Slow scheduled service checks

[Jeff Engstrom]

That fixed my recheck times!  Thanks!!

I find it strange however, that the "smart" setting was not working... 
I am running Nagios 1.1 and I wonder if 1.2 fixes this issue?? 

On Mon, 2004-09-20 at 14:30, Tedman Eng wrote:
> Check latency is indeed very high on your system.  It is the time between
> when a check is supposed to run and when it actually gets run.  By
> comparison, it should be between 1-30 seconds, depending on network
> conditions and nagios load.
> 
> If you have a very large number of down hosts, this can also affect your
> latency, since Nagios "pauses" to check a host and thus skews the scheduling
> queue when this happens.  It can usually catch up though if the other checks
> have enough headroom in the scheduling queue.
> 
> Look at your scheduling queue (best done right after a restart).  The checks
> should be spaced out evenly.  If your normal check interval for most
> services is 5 minutes, look to see that all of your services are scheduled
> to complete before that 5 minutes is up.  
> 
> Try manually setting your inter-check-delay.  
> Your value should be just below .5 (every half second per check) if you have
> 600 services actively checked.
> 
> -----Original Message-----
> From: Jeff Engstrom [mailto:jeff.engstrom at fortix.net]
> Sent: Monday, September 20, 2004 2:01 PM
> To: Nagios-Users
> Cc: teng at dataway.com
> Subject: RE: [Nagios-users] Slow scheduled service checks
> 
> 
> Here is the servers performance metrics...
> 
> Time Frame		Checks Completed 
> <= 1 minute:		35 (5.3%)
> <= 5 minutes:		249 (37.5%)
> <= 15 minutes:		664 (100.0%)
> <= 1 hour:		664 (100.0%)
> Since program start:	664 (100.0%)
> 
> Metric			Min.		Max.		Average
> Check Execution Time:	< 1 sec		5 sec		0.396 sec 
> Check Latency:		359 sec		476 sec		415.349 sec 
> Percent State Change:	0.00%		17.04%		0.03%
> 
> I don't have any excessively long check intervals as you might notice
> from the data above.  The check latency seems high to me but I don't
> have a complete understanding of what the value represents.
> 
> Thanks again!
> Jeff
> 
> 
> On Mon, 2004-09-20 at 13:24, Tedman Eng wrote:
> > Please let us know your performance metrics
> > 
> > Check execution times and check lantency (table in the top right).
> > Would also be helpful to see active check completion rate (table in the
> top
> > left)
> > 
> > These should help pinpoint where the slowdown is.
> > 
> > 
> > Also to optimize, if you have some checks that are long-intervalled (run
> > only once every day, etc), you should consider hand calculating the
> > inter-check-delay rather than using the 's' method.  Use the formula from
> > the documentation, but toss out any long-interval checks, since they'll
> > adversely skew the calculations.
> > 
> > 
> > -----Original Message-----
> > From: Jeff Engstrom [mailto:jeff.engstrom at fortix.net]
> > Sent: Monday, September 20, 2004 10:41 AM
> > To: nagios-users at lists.sourceforge.net
> > Subject: [Nagios-users] Slow scheduled service checks
> > 
> > 
> > Hello all,
> > 
> > I have a server monitoring some 1500 points and it seems for the most
> > part to run quite well. However, for one reason or another the "Last
> > Check" times are off when a service is down. That is not the only
> > problem actually... it appears that it can take some 15mins after the
> > service is restored for the update to reach the interface.
> > 
> > The main cfg is detailed below...
> > 
> > check_external_commands=1
> > command_check_interval=-1
> > log_rotation_method=d
> > use_syslog=1
> > log_notifications=1
> > log_service_retries=1
> > log_host_retries=1
> > log_event_handlers=1
> > log_initial_states=1
> > log_external_commands=1
> > log_passive_service_checks=1
> > inter_check_delay_method=s
> > service_interleave_factor=s
> > max_concurrent_checks=18
> > service_reaper_frequency=3
> > sleep_time=1
> > service_check_timeout=60
> > host_check_timeout=60
> > event_handler_timeout=30
> > notification_timeout=30
> > ocsp_timeout=5
> > perfdata_timeout=5
> > retain_state_information=1
> > retention_update_interval=60
> > use_retained_program_state=0
> > interval_length=60
> > use_agressive_host_checking=0
> > execute_service_checks=1
> > accept_passive_service_checks=1
> > enable_notifications=1
> > enable_event_handlers=1
> > process_performance_data=0
> > obsess_over_services=1
> > ocsp_command=submit_check_result
> > check_for_orphaned_services=1
> > check_service_freshness=1
> > freshness_check_interval=60
> > aggregate_status_updates=1
> > status_update_interval=15
> > enable_flap_detection=1
> > low_service_flap_threshold=5.0
> > high_service_flap_threshold=20.0
> > low_host_flap_threshold=5.0
> > high_host_flap_threshold=20.0
> > 
> > Thanks for any help on this!
> > 
> > 
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