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Starting and Stopping Data Logging
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The DCS will automatically start logging as soon as you create it if you select the Start This Data Collector Set Now option in the Create New Data Collector Set wizard . If you don t select the Start This Data Collector Set Now option, logging must be started manually . After you create the DCS, use the following methods to start and stop logging:
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Right-click the DCS name in the User Defined Data Collector Sets node and select Start or Stop Action from the shortcut menu . Highlight the DCS name in the User Defined Data Collector Sets node and click the Start the Data Collector Set button or the Stop the Data Collector Set button on the Diagnostic Console toolbar .
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To start performance counter logging automatically when the system reboots,
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create a scheduled task to run using System Startup as the condition and use Logman.exe to start the log.
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Viewing performance Data
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After you create the DCS, it is listed in the Reports section of Performance Monitor, as shown in Figure 21-4 .
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Performance Monitoring CHapTER 21
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FIgURE 21-4 Using reports to view performance data
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Additional methods for opening logged performance data include:
Double-clicking a Performance Monitor log ( .blg) file opens the log in Performance Monitor with all configured counters shown . Using the shortcut menu for the data collectors listed under Data Collector Sets in the Reports node in the Diagnostic Console . Right-clicking a data collector listed under the DCS name in the Reports node and selecting the desired view mode .
You can select the following three view modes from the Data Collector shortcut menu:
Performance Monitor View If you select the Performance Monitor menu item, the Performance Monitor log file is displayed in the line chart with all configured counters . Folder View If you select the Folder menu item, the folder containing the selected data collector s files is displayed . Report View If you enabled the Data Manager for the DCS, the Report menu item is available when you right-click the data collector in the Reports node . If you did not enable the Data Manager, the Reports menu option will be inaccessible . The Data Manager report provides a summary of the logged performance data, as shown in Figure 21-5 . The report is saved as an XML file in the DCS folder associated with the selected data collector .
CHapTER 21
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FIgURE 21-5 Example of a Data Manager report
If a user clicks a log that is currently started, the main Performance Monitor window displays a green status bar with a Collecting Data label . To view the log, you must first stop the DCS for the log . Log files are listed under the Data Collector Set node in the Reports node . File names follow a naming convention of computer_name_YYYYMMDD_NNNNNN The serial number NNNNNN is incremented each time the DCS is restarted .
Comparing performance Monitor Logs
You can use Performance Monitor s Compare feature to overlay multiple log files for comparison . This feature is most useful for comparing multiple log files that have been configured to log the same data points for the same amount of time . To access the Compare feature, you must start Performance in stand-alone mode . After Performance Monitor is open, you can view and compare log files by performing the following steps:
Type perfmon /sys /comp to open Performance Monitor in stand-alone mode for comparison, and then click the View Log Data button on the toolbar to open the Performance Monitor properties with the focus on the Source tab, as shown here .
Performance Monitoring CHapTER 21
2. 3.
Click the Log Files option and click Add to open the Select Log File dialog box . Locate the Performance Counter log ( .blg) file that you want to open and then click Open . The log file will be added to the open Performance Monitor instance, but no counters will be added by default . Click the Add button on the toolbar to open the Add Counters dialog box and add the counters that you want to display . The counter data will now be displayed in Performance Monitor . Repeat steps 1 through 4 to open the second log file in a separate stand-alone Performance Monitor instance and display the desired counters . After you open the logs for comparison, two opaque Performance Monitor windows will open on the desktop . Position the anchor window which may be either one of the Performance Monitor windows on your desktop and resize it as desired . This will be the Performance Monitor window upon which you overlay the other window . Select the second Performance Monitor window which will be overlaid on top of the first window to bring it into focus, click the Compare menu, point to Set Transparency, and then select the desired transparency level . Note that transparency here is not related to the Windows Vista Aero Glass feature and will work on systems that are not capable of supporting Aero Glass . The Set Transparency option sets the transparency of the window to be overlaid on the anchor window . The transparency options are No Transparency, 40% Transparency, and 70% Transparency . When you set the transparency to 40%, the desktop background remains visible through the second window .
5. 6.
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