service latency troubles

[Antoine Musso]

Hello,

  For testing purposes, we are monitoring 1750 services on 580 hosts. We 
would like to check each service every 300 second, unfortunatly, nagios 
report a service check latency of 150 to 250 seconds !

I noticed nagios launch roughly 200 checks and then idle for roughly a 
minute. I checked that using a lame script :

   while true; do ps -u nagios | wc -l; sleep 1; done;


Our inter_check_delay_method and inter_leave_factor_method are set to 
smart :

     SERVICE SCHEDULING INFORMATION
     -------------------------------
     Total services:                     1750
     Total scheduled services:           1750
     Service inter-check delay method:   SMART
     Average service check interval:     300.00 sec
                                         ^^^
This is our aim -----------------------///

     Inter-check delay:                  0.17 sec
     Interleave factor method:           SMART
     Average services per host:          3.01
     Service interleave factor:          4
     Max service check spread:           5 min
     First scheduled check:              Fri Oct 10 17:00:15 2008
     Last scheduled check:               Fri Oct 10 17:05:15 2008


The maximum concurrent service checks is set to 200 :

      CHECK PROCESSING INFORMATION
      ----------------------------
      Check result reaper interval:       10 sec
      Max concurrent service checks:      200


And here is an overview of nagiostat output (we do not use passive 
checks nor flapping detection).

   Total Services:                        1750
   Services Checked:                      1750
   Services Scheduled:                    1750
   Services Actively Checked:             1750

   Total Service State Change:            0.000 / 55.720 / 0.530 %
   Active Service Latency:                146.819 / 214.765 / 177.500 sec
   Active Service Execution Time:         0.083 / 12.984 / 1.074 sec
   Active Service State Change:           0.000 / 55.720 / 0.530 %
   Active Services Last 1/5/15/60 min:    92 / 1098 / 1750 / 1750
   Services Ok/Warn/Unk/Crit:             1671 / 60 / 7 / 12

Active Service Checks Last 1/5/15 min:  176 / 1159 / 3432
    Scheduled:                           176 / 1159 / 3432
    On-demand:                           0 / 0 / 0
    Cached:                              0 / 0 / 0


I have not found how to make nagios to launch service checks more often 
than every minutes. Does anyone have any idea ? :)


-- 
Antoine MUSSO
DISIT/PROD/QFO/OUT
mailto:antoine.musso at laposte.fr
tél. 02 40 12 73 62
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