Hi, I have a Nagios 3.2.3 deployment with 1000+ Hosts and 3000+ services. This Nagios runs together with NDO and PNP (in bulk mode) in a server with 4GB of Ram and 4 cpus. One day I realized that the check delay in the performance CGI was very high (300-400 seconds). It was very strange so I took the tunning guide form nagios (<a href=http://nagios.sourceforge.net/docs/3_0/tuning.html>http://nagios.sourceforge.net/docs/3_0/tuning.html</a>) and applied all the points I could. In particular I adjusted the max_concurrent_checks to zero (no limit): max_concurrent_checks=0 The reaper event: service_reaper_frequency=5 max_check_result_reaper_time=15 and checked that the host checks where not forced. In addition I configured 15 seconds of host check cache. cached_host_check_horizon=15 But the problem remains. And the load of the server is not very high. Load of 2,5, 2 GB of free memory and an average utilization of disc of 7%. I disabled NDO and PNP but it was useless. After the first round of checks, the delay returns, while the load of the server doesn't grow. I have searched in google but all the problems area because of the load in the server, but here this is not the main problem. So my question is ¿what can I do now?¿There is some variable that shows me where to look? I'm a bit lost right now and I don't know how to find the problem. ¿Or maybe the only way is to configure a master-slave nagios in order to maximize the server utilization? In addition, I have pretty big timeouts (60 seconds) because of the high latency on the network. All your help is appreciated. Thank you in advance. nagiostats Nagios Stats 3.2.3 Copyright (c) 2003-2008 Ethan Galstad (<a href=www.nagios.org>www.nagios.org</a>) Last Modified: 10-03-2010 License: GPL CURRENT STATUS DATA ------------------------------------------------------ Status File: /usr/local/argos/aplicaciones/nagios/var/status.dat Status File Age: 0d 0h 0m 11s Status File Version: 3.2.3 Program Running Time: 0d 20h 56m 7s Nagios PID: 21834 Used/High/Total Command Buffers: 0 / 0 / 4096 Total Services: 4032 Services Checked: 4032 Services Scheduled: 4030 Services Actively Checked: 4032 Services Passively Checked: 0 Total Service State Change: 0.000 / 37.300 / 0.163 % Active Service Latency: 32.876 / 442.138 / 415.816 sec Active Service Execution Time: 0.051 / 60.097 / 1.545 sec Active Service State Change: 0.000 / 37.300 / 0.163 % Active Services Last 1/5/15/60 min: 237 / 1530 / 4020 / 4020 Passive Service Latency: 0.000 / 0.000 / 0.000 sec Passive Service State Change: 0.000 / 0.000 / 0.000 % Passive Services Last 1/5/15/60 min: 0 / 0 / 0 / 0 Services Ok/Warn/Unk/Crit: 3766 / 38 / 44 / 184 Services Flapping: 0 Services In Downtime: 0 Total Hosts: 931 Hosts Checked: 931 Hosts Scheduled: 931 Hosts Actively Checked: 931 Host Passively Checked: 0 Total Host State Change: 0.000 / 12.370 / 0.077 % Active Host Latency: 0.000 / 441.308 / 416.063 sec Active Host Execution Time: 0.062 / 10.113 / 0.395 sec Active Host State Change: 0.000 / 12.370 / 0.077 % Active Hosts Last 1/5/15/60 min: 74 / 423 / 931 / 931 Passive Host Latency: 0.000 / 0.000 / 0.000 sec Passive Host State Change: 0.000 / 0.000 / 0.000 % Passive Hosts Last 1/5/15/60 min: 0 / 0 / 0 / 0 Hosts Up/Down/Unreach: 897 / 24 / 10 Hosts Flapping: 0 Hosts In Downtime: 1 Active Host Checks Last 1/5/15 min: 109 / 535 / 1583 Scheduled: 87 / 433 / 1300 On-demand: 22 / 102 / 283 Parallel: 87 / 438 / 1323 Serial: 0 / 0 / 0 Cached: 22 / 97 / 260 Passive Host Checks Last 1/5/15 min: 0 / 0 / 0 Active Service Checks Last 1/5/15 min: 304 / 1605 / 4924 Scheduled: 304 / 1605 / 4923 On-demand: 0 / 0 / 1 Cached: 0 / 0 / 0 Passive Service Checks Last 1/5/15 min: 0 / 0 / 0 External Commands Last 1/5/15 min: 0 / 0 / 0 nagios -s Nagios Core 3.2.3 Copyright (c) 2009-2010 Nagios Core Development Team and Community Contributors Copyright (c) 1999-2009 Ethan Galstad Last Modified: 10-03-2010 License: GPL Website: <a href=http://www.nagios.org/>http://www.nagios.org</a> Warning: aggregate_status_updates directive ignored. All status file updates are now aggregated. Warning: downtime_file variable ignored. Downtime entries are now stored in the status and retention files. Warning: comment_file variable ignored. Comments are now stored in the status and retention files. Timing information on object configuration processing is listed below. You can use this information to see if precaching your object configuration would be useful. Object Config Source: Config files (uncached) OBJECT CONFIG PROCESSING TIMES (* = Potential for precache savings with -u option) ---------------------------------- Read: 0.080036 sec Resolve: 0.010660 sec * Recomb Contactgroups: 0.002666 sec * Recomb Hostgroups: 0.004086 sec * Dup Services: 0.034632 sec * Recomb Servicegroups: 0.001277 sec * Duplicate: 0.010939 sec * Inherit: 0.005594 sec * Recomb Contacts: 0.000001 sec * Sort: 0.000000 sec * Register: 0.074413 sec Free: 0.008730 sec ============ TOTAL: 0.234920 sec * = 0.071741 sec (30.54%) estimated savings RETENTION DATA TIMES ---------------------------------- Read and Process: 0.495480 sec ============ TOTAL: 0.495480 sec Timing information on configuration verification is listed below. CONFIG VERIFICATION TIMES (* = Potential for speedup with -x option) ---------------------------------- Object Relationships: 0.060039 sec Circular Paths: 0.026557 sec * Misc: 0.005999 sec ============ TOTAL: 0.092595 sec * = 0.026557 sec (28.7%) estimated savings EVENT SCHEDULING TIMES ------------------------------------- Get service info: 0.014509 sec Get host info info: 0.002853 sec Get service params: 0.000078 sec Schedule service times: 0.039947 sec Schedule service events: 0.034656 sec Get host params: 0.000001 sec Schedule host times: 0.007519 sec Schedule host events: 0.029519 sec ============ TOTAL: 0.129082 sec Projected scheduling information for host and service checks is listed below. This information assumes that you are going to start running Nagios with your current config files. HOST SCHEDULING INFORMATION --------------------------- Total hosts: 931 Total scheduled hosts: 931 Host inter-check delay method: SMART Average host check interval: 259.01 sec Host inter-check delay: 0.28 sec Max host check spread: 30 min First scheduled check: Tue Oct 11 13:14:08 2011 Last scheduled check: Tue Oct 11 13:18:26 2011 SERVICE SCHEDULING INFORMATION ------------------------------- Total services: 4032 Total scheduled services: 4030 Service inter-check delay method: SMART Average service check interval: 299.55 sec Inter-check delay: 0.07 sec Interleave factor method: SMART Average services per host: 4.33 Service interleave factor: 5 Max service check spread: 30 min First scheduled check: Tue Oct 11 13:15:07 2011 Last scheduled check: Tue Oct 11 13:20:07 2011 CHECK PROCESSING INFORMATION ---------------------------- Check result reaper interval: 5 sec Max concurrent service checks: Unlimited PERFORMANCE SUGGESTIONS ----------------------- I have no suggestions - things look okay. <tt>-- Javier Vela Diago S2 GRUPO Ramiro de Maeztu, 7 bajo. 46022 Valencia Tel: 963.110.300 Fax: 963.106.086 e-mail : jvela arroba s2grupo punto es </tt><a href=http://www.s2grupo.es/><tt>http://www.s2grupo.es</tt></a>