Monitoring in .NET

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It is possible that a corrupt message or a message with a very large attachment is blocking a queue and that deleting that message (typically with an NDR) will solve the problem. It is also possible that a resource on your Exchange Server 2007 server is under stress. Lesson 2 of this chapter discusses how you monitor system performance. Lesson 2 also discusses the Best Practice Analyzer tool and the Exchange Troubleshooting Assistant tools. While these are general tools for analyzing the health of your Exchange organization, the analyses they provide can assist when you detect queue problems resulting in exceeded thresholds.
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Which Exchange Performance Object provides the Messages Queued For Submission and Receipt Queue counters The MSExchangeIS Mailbox Performance Object.
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Setting Queue Thresholds
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You can use the Performance Logs and Alerts tool in Exchange Server Performance Monitor to alert you if the number of messages queued for submission reaches 100. As previously stated, the actual value you set for this alert depends on a number of factors, and the figure of 100 is for the purpose of demonstration only. To set an alert, you expand Performance Logs And Alerts in the Exchange Server Performance Monitor Console Root, right-click Alerts, and select New Alert Settings. You give the alert a name, for example, Submission Queue, and click OK. You then click Add on the General tab. In the Add Counters dialog box, you select the MSExchangeIS Mailbox Performance Object, select All Instances, and then select the Messages Queued For Submission counter. Clicking Add adds this counter. You then specify Over in the Alert When The Value Is box and 100 in the Limit box. You need to set a limit for each instance of the counter, and you can optionally set different limits for each instance. You can also specify how often you want the counter to be scanned. Figure 9-11 shows these settings. If you want to, you can specify a user account under which the alert should run (by default, it runs under the logged-on account) and supply a password.
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Lesson 1: Monitoring Mail Queues
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Figure 9-11
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NOTE
Specifying an alert
The Over option
In the Alerts tool, the Over option actually means greater than or equal to. Therefore, if you specify a value of 100, the alert will trigger on a value of 100 (not 101).
You then select the Action tab and are presented with a choice of alert actions, as shown in Figure 9-12. By default, a triggered alert logs an entry in the Application log. You can also send a network message to an administrator s client computer, start a performance data log to record the values in other specified counters, or start a program for example, to send an alert to a pager. You can set an alert to start a performance data log in Exchange Server Performance Monitor and record values in additional counters, for example, Messages Delivered/ Sec. Alternatively, you can use System Monitor in the same tool to look at these counters immediately in real time. If you determine that you have a problem and the alert was not triggered by a traffic spike, you need to take corrective action. You can identify whether the problem is in a single storage group or in all storage groups by looking at instances of the counters.
9
Monitoring
Figure 9-12
Alert actions
Microsoft Operations Manager
Microsoft Operations Manager (MOM) 2005 Service Pack 1 (SP1) provides an alternative and powerful method of monitoring Microsoft Exchange Server 2007 servers. MOM can use either Microsoft SQL Server 2005 or Microsoft SQL Server 2000 as its report server database. The tool is typically used in the enterprise environment to generate alerts when operational failures and performance problems occur and generate reports of operational health over time so that you can estimate future demands based on usage patterns and other performance data. MOM indicators represent the state of health of servers and server roles. The Exchange 2007 Management Pack for MOM 2005 SP1 contains rules to monitor a comprehensive array of Exchange Server 2007 server health indicators and create alerts when problems are detected or when predefined thresholds are exceeded. Each rule starts with the word Collect to indicate that it is collecting data. Rules that collect data for reports end with Report Collection. All performance data collection rules are related to a threshold rule or a report or provide data to another MOM rule.
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