Configuring Monitor Thresholds - 3Com 3C15500 - Network Director User Manual

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Discovery you can do so by canceling the Network Discovery from within
the Network Discovery Progress dialog box.
Configuring Monitor 3Com Network Director can monitor various services on devices,
Thresholds including FTP, HTTP, SMTP, POP3, DNS and NFS on any end station and IP
Ping on all IP devices, by sending appropriate queries to the devices. Due
to the latency introduced by WAN links in the path to remote sites,
remote devices will naturally have a longer response time to these queries
when compared to local devices. If the latency introduced by the WAN
links in the path to a particular remote site is very high then this may lead
to 3Com Network Director incorrectly generating events indicating that
the devices at that site as being slow to respond to services and will also
result in the live and historical graphs of monitoring data showing that
devices at that site have high response times.
If it is normal for a particular remote device to have slow response times
to service monitor queries then it is recommended that you increase the
thresholds configured for the service monitors on that device in order to
prevent this incorrect reporting taking place. Details of how to configure
the thresholds for monitors are given in "Setting Thresholds for
Monitor-Based Events"on page 356.
In order to configure the threshold appropriately for the service monitors
on such a remote device it is necessary to determine the normal range of
response times that are seen for that device. The simplest method of
doing this is to view historical reports of the response times for that
device.
To generate a historical report for a device, select the device in the map or
tree and then select Monitoring > Historical Report. See "Performance
Reporting" on page 385 for more information on historical reports.
Provided you have been monitoring the services on the device
continuously for an extended period of time, it will be obvious from the
graphs what the normal response time ranges are for the different
services.
You can use this information to configure the high threshold for each
service monitor on the device such that the warning threshold is just
above the maximum of the normal response time range.