?– Dotted lines are used in the chart whenever data is insufficient to calculate a
steady stability index. This may happen if the stability is constantly fluctuating
or if the server has been recently set up.
?–? Any significant change in the system time is noted on the graph to denote a
system time adjustment. It will indicate the old time, the new time, and the
date the change occurred (based on the new time).
Figure 7-27. Specifying the stop condition
248 Microsoft Windows Server 2008 Administration
Reports
Reports are the main reason why you want to use data collector sets when collecting
performance metrics about your server. When a data collector set is running, it stores all
the data points it gathers into a log file in the directory you specify. When you stop data
collection, the data from this capture is made available to you in the form of a report.
Reports can display either a summary performance report or a Performance Monitor
screen with data from the data file rather than from realtime counters. If, for example,
you had the System Performance data collector set running for 12 hours, the resulting
Performance Monitor report will display the graph of all the data points collected for
this data collector set over the course of those 12 hours. You can then quickly see trends
on your servers and use it to track spikes in your system that could indicate capacity
or performance issues.
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