Scheduling queue falling behind.

[Randal Kornelsen]

I had this problem and Jason describes one work-around to it (making host
checks complete as fast as possible).  My solution was to disable all host
checks (my latency was still too high even with fast host checks).

My understanding is that Nagios must complete the host checks of a down host
before ANY service checks on any host are performed.  If a host is down and
your checks are configured to run over X number of minutes Y times then you
are stalled for that long.  If you have multiple hosts down then you can
just multiply your latency.

Prove this to yourself by going in to each configured host that you have
that is down and disabling the host checks.  Your service checks should come
right up to time.


Randal



-----Original Message-----
From: nagios-users-bounces at lists.sourceforge.net
[mailto:nagios-users-bounces at lists.sourceforge.net]On Behalf Of Jason
Byrns
Sent: Thursday, February 15, 2007 11:36 AM
To: nagios-users at lists.sourceforge.net
Subject: Re: [Nagios-users] Scheduling queue falling behind.


Morris, Patrick wrote:
>> I'm not sure this is the right place to ask this, but I've 
>> been trying to figure out why the scheduling queue on my 
>> nagios server is always 20-30 minutes behind the current 
>> time. 

I ran into something like this, not that long ago.  Host and service 
check latencies being very high, like almost 15-20 minutes.  After some 
research, the suggested fix was to modify the check_host_alive and 
related commands.

Change them so they only use a single packet to check.  Add "-p 1" as a 
flag to your ping-type check commands.

Once I followed this advice, my average latency went from 900 seconds or 
so, to usually less than a second.

We monitor about 250-300 devices, 95% of them only have a single service 
check.  (Usually SNMP)

-- 
Jason Byrns
Production Manager
System Administrator
http://www.MicroLnk.com/
402-328-8600 ext. 653

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