3Com 3C15500 - Network Director - PC, Руководство пользователя, Страница: 390 / 924

386 C
HAPTER
9: P
ERFORMANCE
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EPORTING
Data resolutions 3Com Network Director maximizes the usefulness of collected data by
supporting a number of resolutions for logged data. For example, data
over the past two weeks is stored at a high resolution, which allows you
to precisely pinpoint recent network incidents. In contrast, data is also
stored at a low resolution, for up to two years, so you can see emerging
trends in usage over time.
The monitor poll rates will usually be shorter than the resolutions used by
3Com Network Director for logging data. In order to cope with this 3Com
Network Director aggregates the data from multiple monitor polls into a
single logged data record. This consolidation of data can average-out
short-term spikes that were seen in the monitored data.
Reporting 3Com Network Director presents long-term data in the form of historical
HTML reports that display data collected over time in graphs, allowing
you to analyze trends in your network and identify problems. Historical
reports on links can show utilization changing over long periods of time,
and allow you to predict and assess demand for more bandwidth.
Components
Historical report The historical report can be accessed in any one of three ways:
■
select a single device or link in the map, and from the right-click
menu, select
Historical Report .
■
select a single device or link in the map, and from the main window’s
Monitoring menu, select Historical Report .
■
launch the More Detail dialog box for a monitor-based event in the
event browser, select the Graph tab and click the Historical Report
hot-link below the graph.