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Windows Server includes several tools that help identify potential issues with system resources. When systems are not configured properly and are not assigned appropriate resources such as CPU, RAM, or disk space, systems monitoring will help you identify where bottlenecks occur. When you identify these bottlenecks, you then assign additional resources to the system. If the system is physical, this most often means shutting down the system; installing new resources, for example, additional memory chips; and then restarting the system. If the system is virtual, then depending on the virtualization engine you use, you might be able to allocate new resources while the virtual machine is still running. If not, shut it down; allocate new resources, for example, an additional CPU and additional RAM; and then restart it. After the system is restarted, monitor its performance again to identify whether the new resources solved the problem. The tools you can rely on to identify performance bottlenecks in Windows Server 2008 include:
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Task Manager, which displays current system resource usage. Event Viewer, which logs specific events, including performance related events.
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Lesson 2: Proactive Directory Performance Management
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Reliability Monitor, which tracks changes brought to the system, enabling you to identify whether a change could be the cause of a new bottleneck. Performance Monitor, which collects data in either real time or at specific intervals to identify potential issues. Windows System Resource Manager (WSRM), which can be used to profile specific applications to indicate which resources they need at which time. You can also use it to manage application resource allocation based on the profiles you generate.
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You can use other tools as well, such as Microsoft System Center Operations Manager, to monitor the state of a system continuously and automatically correct well-known issues. Operations Manager relies on custom management packs to monitor specific applications.
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Using Task Manager
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The simplest of all tools to use is Task Manager. This tool provides real-time system status information and covers several key aspects of a system s performance, including:
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Running applications Running processes Running services Performance, including CPU and memory usage Networking, including network interface card (NIC) utilization Currently logged-on users
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You can access Task Manager in a variety of ways, the most common of which is to right-click the taskbar and select Task Manager. Another common method is to use the Ctrl+Alt+Delete key combination and click Task Manager when the menu choices appear. For example, this is how you would access Task Manager on Server Core because it does not include a taskbar. You can also type Taskmgr.exe at a command prompt. When you access information regarding system performance, the Performance tab is the most useful tab. (See Figure 13-7.) This displays complete information about your system s key resource usage. It details physical and kernel memory usage. This tab also includes a button that gives you access to Resource Monitor. Clicking this button will launch Resource Monitor while keeping Task Manager open. Resource Monitor is a super Task Manager because it brings together the CPU, disk, memory, and network usage graphs in a single view. (See Figure 13-8.) In addition, it includes expandable components for each resource, displaying details of each component so that you can identify which processes might be the culprit if issues are evident. These two tools are ideal for onthe-spot verifications of resource usage. You should rely on them if you need to identify immediately whether something is wrong with a server.
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13
Directory Business Continuity
Figure 13-7 Viewing real-time performance information in Task Manager
For example, if the system does not have enough memory, you will immediately see that memory usage is constantly high. In this case, Windows will be forced to use on-disk virtual memory and will need to swap or page memory contents constantly between physical and virtual memory. Constant paging is a typical issue that servers with insufficient physical memory face and is often indicated by slow system behavior. One good indicator of insufficient memory is slow Server Manager operation.
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