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In order to define what you want to monitor, you need to become familiar with a few concepts: objects, counters, and instances These concepts will allow you a much deeper level of monitoring granularity For example, monitoring your server s processor utilization only gives you a bird s-eye view of what your server is doing Instead, you could look at a specific processor s utilization while running a specific application; then you have a better idea of what your server is actually doing
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Performance Objects
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An object can represent any facet of the operating system Objects like Memory, Physical Disk, and Processor represent hardware on your server Objects such as Server, Domain Name System (DNS), Browser, and Redirector represent specific services running on the server Objects such as TCP (Transmission Control Protocol), NNTP (Network News Transfer Protocol), and ICMP (Internet Control Message Protocol) represent specific protocols running on the server When you install any Microsoft BackOffice product, such as Exchange 2007 Server, additional objects specific to that product are added in order to be monitored
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Microsoft Exchange Server 2007: A Beginner s Guide
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A set of counters is predefined for each object These counters are calculated values measuring some specific aspect of that counter For instance, the % Processor Time counter of the Processor object would measure what percentage of the time the processor is busy There are a number of counter types utilized to give you valuable (and not just raw) data
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A server may have multiple objects of the same type, requiring some method to distinguish between them while monitoring For example, if your server has multiple processors, and you wanted to see the % Processor Time for only one of those processors, you need to be able to select it to be monitored independently of the other processors Utilizing instances allow you to accomplish this To summarize these three concepts, think of their relationship in this way: You select an object you wish to monitor and choose the counter to report to you a specific measurement about that object If you need more granularity, use a specific instance of that object
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What you monitor can depend on what your monitoring focus is If you are troubleshooting, you will look at different counters than if you are forecasting resource usage The following table lists the aspects of performance you may want to focus on when monitoring Performance Aspect Monitoring Focus Usage Bottleneck Throughput Verify resource usage is within acceptable limits Look for excessive demand on a certain resource resulting in a possible slowdown of overall performance Ascertain the current performance rate of a specific resource
USING EXCHANGE SERVER PERFORMANCE MONITOR
Windows 2003 provides the System Monitor Microsoft Management Console (MMC) snap-in as a comprehensive performance monitoring tool System Monitor allows you to both view real-time data and log current data for future viewing In previous versions of Exchange, you were on your own to not only open the snap-in, but also to determine what counters should be added With Exchange 2007, these first two steps have been taken care of for you To open System Monitor (renamed to Exchange Server Performance Monitor, although it is the same as System Monitor), select Toolbox in the console tree within the Exchange Management Console, select the Performance Monitor,
16:
Performance Tuning Exchange Server 2007
and select Open Tool from the action pane The Exchange Server Performance Monitor, shown in Figure 16-1, appears, with a number of prepopulated counters to begin your performance monitoring Table 16-1 lists the default counters and explains why they are important to monitoring the performance of your Exchange server What you will notice about the default counters is that, in and of themselves, they do not provide much information about what could be a potential problem Rather, these counters are very high-level indicators of performance For example, if you were to look at the RPC Requests counter and you knew what a good and bad value was for that counter (by the way, a lower number is worse), the counter itself still wouldn t tell you what this performance issue is; you will need to continue to add more counters to drill down to the core problem It could be a lack of memory or perhaps a full disk that is causing thrashing (searching for spaces on the disk to store data) which, in turn, is slowing down the Exchange server s ability to process RPC requests The whole point is that with these basic counters alone, you simply won t know what the issue is So let me cover some basics on how to create additional counters to monitor
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