Nagios monitoring limits: hosts and services

[Morris, Patrick]

> I'm starting to get complaints from our Operations group that 
> the Nagios web GUI is "getting slow".  This is on a version 
> 1.x Nagios server.  The server is monitoring 678 hosts and 
> 3481 services organized in 29 host groups.  Most checks are 
> done on 5 minutes intervals.  I've gone over all of the 
> documented "tweaks" to improve performance.  The hardware 
> seems adequate and isn't starved for CPU; loads seem 
> reasonable; although the "Check Latency" under the 
> "Performance Info" screen continually creeps up - currently 
> at Max. 23 seconds.
> 
> Time to load the "Status Overview" screen: 8,5,6,6 seconds 
> Time to load the "Status Summary" screen: 42,35 
> 
> I guess my first question is what do your uses expect in 
> terms of performance?
> Am I missing the boat on something real basic here?
> How many hosts/services do you manage per Nagios host?

Those times seem long for that number of hosts. In most cases (including
a system I'm looking at now with around 2100 hosts and 11,000 services
being monitored) the bottleneck's bandwidth more than the server on the
big pages like the service detail, but I haven't used a Nagios 1.x
system for quite some time.

Have you tried keeping your status data in RAM? I've seen some pretty
decent performance gains from doing that in other cases.

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