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This topic provides more information on how to manage service monitoring.
 Opening host info window in the Services tab
With this window you can list, modify, create and remove monitored services. It not only lists all Services, but also presents charts, where you can review the service response time value over time. Charts can present the service monitoring information in real-time.
1.Double-click the host icon or select Host info from its context menu. 2.Select Performance / Services tab. |
Adding a new service to the monitor or modifying existing one
1.Open Host info window on the Performance / Services tab. 2.Click the add icon (located on the right-bottom side of the services grid) to add a new service or select the existing service and click the edit icon to modify service properties.
The Service properties window will open. 3.Now you have to configure the options. This is described in detail in the following table.
Property
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Description
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Service to monitor
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Name
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Select the service you want to monitor.
This field cannot be changed when editing the existing service. To start monitoring another service, you have to create it.
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On interface/IP
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Select the address on which this service will be monitored.
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Monitoring parameters
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Monitoring time
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After selecting Auto, nVision will control the monitoring interval to ensure frequent polls (based on the number of monitored hosts). If you want to set this to any specific value, then select Set and enter this value in the edit box.
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Requests
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This is the number of requests sent on each poll.
For all TCP services this value should be set to 1, as the protocol has its own mechanism to prevent lost requests (TCP services have their own mechanism to repeat lost requests, so it usually does not make sense to enter a higher value). For ICMP and UDP based services, you should set it to 2-3 to ensure that one incidentally lost packet will not trigger false alerts.
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Timeout
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The time to wait for a response. If not received by that time, a request is considered lost.
For ICMP and UDP services value of 1000 - 2000 ms will be usually sufficient. For TCP services, because of their nature, you should enter much higher values of 15 000 - 30 000 ms.
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Deleting a service
1.Open Host info window on the Performance / Services tab. 2.Select a service to delete. 3.Click the dustbin icon to delete the service. |
Rediscovering host services
1.Open Host info window on the Performance / Services tab. 2.Click the Discover again option.
nVision will start scanning for new services on all interfaces/addresses of the host. When finished, new services will be added to the list and monitoring of the new services will start. |
Selecting a leading service
For information about the leading service refer to the Monitoring services topic.
1.Open Host info window on the Performance / Services tab. 2.Select a service and select Set as leading from its context menu.
The leading service is indicated by bold font. |
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