Hi List, Below is my stats and nagios.cfg details. HOST SCHEDULING INFORMATION --------------------------- Total hosts: 1815 Total scheduled hosts: 1814 Host inter-check delay method: SMART Average host check interval: 60.00 sec Host inter-check delay: 0.03 sec Max host check spread: 15 min First scheduled check: Tue Aug 30 16:42:02 2011 Last scheduled check: Tue Aug 30 16:43:01 2011 SERVICE SCHEDULING INFORMATION ------------------------------- Total services: 6492 Total scheduled services: 6486 Service inter-check delay method: SMART Average service check interval: 1808.88 sec Inter-check delay: 0.28 sec Interleave factor method: SMART Average services per host: 3.58 Service interleave factor: 4 Max service check spread: 35 min First scheduled check: Tue Aug 30 16:49:34 2011 Last scheduled check: Tue Aug 30 17:18:03 2011 CHECK PROCESSING INFORMATION ---------------------------- Check result reaper interval: 4 sec Max concurrent service checks: Unlimited PERFORMANCE SUGGESTIONS ----------------------- I have no suggestions - things look okay. NAGIOS.CFG ----------------------------- status_update_interval=10 check_external_commands=1 command_check_interval=-1 command_file=/usr/local/nagios/var/rw/nagios.cmd external_command_buffer_slots=4096 lock_file=/usr/local/nagios/var/nagios.lock temp_file=/usr/local/nagios/var/nagios.tmp temp_path=/tmp event_broker_options=-1 log_rotation_method=d log_archive_path=/usr/local/nagios/var/archives 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_checks=1 service_inter_check_delay_method=s max_service_check_spread=35 service_interleave_factor=s host_inter_check_delay_method=s max_host_check_spread=15 max_concurrent_checks=0 check_result_reaper_frequency=5 service_reaper_frequency=4 max_check_result_reaper_time=15 check_result_path=/usr/local/nagios/var/spool/checkresults max_check_result_file_age=3600 cached_host_check_horizon=15 cached_service_check_horizon=15 enable_predictive_host_dependency_checks=1 enable_predictive_service_dependency_checks=1 soft_state_dependencies=0 auto_reschedule_checks=0 auto_rescheduling_interval=30 auto_rescheduling_window=180 sleep_time=0.25 service_check_timeout=120 host_check_timeout=30 event_handler_timeout=30 notification_timeout=30 ocsp_timeout=5 perfdata_timeout=5 retain_state_information=1 state_retention_file=/usr/local/nagios/var/retention.dat retention_update_interval=60 use_retained_program_state=1 use_retained_scheduling_info=1 retained_host_attribute_mask=0 retained_service_attribute_mask=0 retained_process_host_attribute_mask=0 retained_process_service_attribute_mask=0 retained_contact_host_attribute_mask=0 retained_contact_service_attribute_mask=0 interval_length=60 use_aggressive_host_checking=0 execute_service_checks=1 accept_passive_service_checks=1 execute_host_checks=1 accept_passive_host_checks=1 enable_notifications=1 enable_event_handlers=1 process_performance_data=0 obsess_over_services=0 obsess_over_hosts=0 translate_passive_host_checks=0 passive_host_checks_are_soft=0 check_for_orphaned_services=1 check_for_orphaned_hosts=1 check_service_freshness=1 service_freshness_check_interval=60 check_host_freshness=0 host_freshness_check_interval=60 additional_freshness_latency=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 date_format=us p1_file=/usr/local/nagios/bin/<a href="http://p1.pl">p1.pl</a> enable_embedded_perl=1 use_embedded_perl_implicitly=1 illegal_object_name_chars=`~!$%^*|'"<>?,()= illegal_macro_output_chars=`~$&|'"<> use_regexp_matching=0 use_true_regexp_matching=0 daemon_dumps_core=0 use_large_installation_tweaks=0 enable_environment_macros=1