Black Box LES1316A, LES1332A, LES1408A Distributed Monitoring Usage Scenarios, Local office

Time			No	3DES			SSH tunnel
		encryption
NSCA for single check		~ ½ second		~ ½ second			~ ½ second
NSCA for 100 sequential checks		100 seconds		100 seconds			100 seconds
NSCA for 10 sequential checks, batched upload		1 ½ seconds		2 seconds			1 second
NSCA for 100 sequential checks, batched upload		7 seconds		11 seconds			6 seconds
	No		SSL			no encryption -
	encryption					tunneled over
					existing SSH session
NRPE time to service 1 check	1/10th second		1/3rd second		1/8th second
NRPE time to service 10	1 second		3 seconds		1 ¼ seconds
simultaneous checks
Maximum number of simultaneous	30		20 (1,2 and 8) or		25 (8 port), 35 (16
checks before timeouts			25 (16 and 48 port)		and 48 port)

The results were from running tests 5 times in succession with no timeouts on any runs. There are a number of ways to increase the number of checks you can do.

Usually when using NRPE checks, an individual request will need to set up and tear down an SSL connection. This overhead can be avoided by setting up an SSH session to the console server and tunneling the NRPE port. This allows the NRPE daemon to run securely without SSL encryption, because SSH will provide the security.

When the console server submits NSCA results, it staggers them over a certain time period (for example, 20 checks over 10 minutes will result in two check results every minute). Staggering the results like this means that if the power fails or other incident causes multiple problems, the individual freshness checks will be staggered too.

NSCA checks are also batched. In the previous example, the two checks per minute are sent through in a single transaction.

10.4.5 Distributed Monitoring Usage Scenarios

Below are a number of distributed monitoring Nagios scenarios:

I.Local office

In this scenario, the console server is set up to monitor each managed device’s console. Configure it to make a number of checks, either actively at the Nagios server's request, or passively at preset intervals, and submit the results to the Nagios server in a batch.

You can augment the console server at the local office site by one or more Intelligent Power Distribution Units (IPDUs) to remotely control the power supply to the managed devices.

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