Nagios service latency

[Thomas Guyot-Sionnest]

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On 30/10/07 08:29 AM, Marc Powell wrote:
> 
>> -----Original Message-----
>> From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
>> bounces at lists.sourceforge.net] On Behalf Of sunchai (gillnaldo : sun)
>> Sent: Tuesday, October 30, 2007 7:01 AM
>> To: nagios-users at lists.sourceforge.net
>> Subject: [Nagios-users] Nagios service latency
>>
>> Hi all,
>>
>>    I faced problem with nagios service latency. My requirement is
> active
>> service monitoring to router/ network device using "SNMP" and "Ping"
>> command. My environment is big router with ~100 services per device.
>>
>>    How can I optimized nagios config? Thank in advance.
>>
>> Note: I have information below
>> ########## nagios -s ################
>> HOST SCHEDULING INFORMATION
>> ---------------------------
>> Total hosts:                     173
>> Total scheduled hosts:           173
> 
> If this is nagios-2.x or prior, do not force scheduled host checks. You
> don't need to because Nagios will perform them on an as needed basis by
> default when a service on the host returns a non-ok state.
> 
> When those versions of nagios perform host checks, they're done
> sequentially, not in parallel, and _nothing_ else happens, not even
> service checks. This introduces significant delays, especially when
> you're trying to complete many service checks in a short interval.


Something that can help as well is having the host check return as fast
as possible. On my servers I use check_icmp (faster than check_ping
since it has native ICMP support), the check sends only one ping and
timeout after one second (the minimum):

# 'check_host-alive' command definition
define command{
  command_name check-host-alive
  command_line $USER1$/check_icmp -H $HOSTADDRESS$ -w 300.00,80% -c
500.00,100% -p 1 -t 1
}


If you have a few routers down you can also alleviate the load by
disabling active checks on them until they're back up (otherwise each
failing service check on them will force running a 1-second host check
in serial).

The definitive answer to your problem will be in Nagios 3 with host
check caching...

Thomas
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