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Monitoring Exchange Server 2010 ChapTEr 17 785
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The processor is one of the core components that need monitoring to ensure server health. Standard counters include the total percentage of processor time, the percentage of user-mode processor time, and the percentage of privilege-mode processor time. Another key counter is the processor queue length. If this length is outside of the operating threshold, the processor may have more work than it can handle. This may be a good indicator that a server could use a faster processor or additional cores. Notes from the field
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Exchange and Hyper-V CPU Utilization Troubleshooting
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hen dealing with a Virtualized Exchange Server 2010, it is very important to select the correct counters to accurately measure CpU performance as well
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as any other object. When we have Exchange Server 2010 as a guest in a hyper-V environment, the counters in the GUEST Virtual Machine do not show the actual physical processor utilization. Instead, we need to use hyper-V hypervisor performance Counters in the root partition to determine the real CpU load. We also need to keep in mind that the host hardware is sharing its resources among other loads and virtual machines and it is important to identify whether another virtual machine is creating the bottleneck in the host and thus affecting Exchange. Therefore, as far as collecting data for performance is concerned, a more precise picture is obtained by collecting it in the root partition, or in the host itself. as far as the CpU is concerned, a CpU spinner program inside the guest can lead the CpU in the guest operating system to be at 100 percent level, but it has little effect on the host and other virtual machines running. Thus one very important thing to recognize is which virtual machine you are measuring, and %Guest run Time will match the instance name with the virtual machine you need to measure. It is very likely to be misled by an Exchange server running in a virtual environment and its CpU usage, because the guest could be spinning the CpU and task manager in the virtual machine, showing it is at 100 percent CpU utilization, whereas in the root partition the overall CpU utilization is nowhere near that number. It is critical to realize that in a virtual environment, the accurate measure more often than not comes from the root partition. please use the additional resources at the end of the chapter for more information.
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ChapTEr 17
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Operating and Troubleshooting Exchange Server 2010
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MEMOrY
Exchange 2010 benefits by using the 64-bit processor s ability to address large amounts of memory efficiently. Monitoring the page file can reveal performance impact if the server has to constantly swap pages to slower disk storage. Increasing memory or reducing the server s load are ways to improve performance.
aCTIVE DIrECTOrY aCCESS
Exchange heavily relies on Active Directory for everything from configuration information to user property information. Therefore, it is critical to monitor response times for searches and reads. Ensure that you have a good ratio of Exchange server cores to Active Directory cores. If the Global Catalog servers are running on a 32-bit platform, the recommended ratio of Active Directory server cores to Exchange Mailbox Server cores is 1:4. If the Global Catalog servers are running on a 64-bit platform, the recommended ratio of Active Directory server cores to Exchange Mailbox Server cores is 1:8 (assuming the Active Directory server has enough memory to cache the entire Active Directory database in memory). Upgrading Active Directory servers to 64 bit may be a way to get more performance without scaling out with new hardware.
DISK STOraGE
Finally, Exchange is a very demanding database application that requires consistent and fast disk access. When I/O counters fall outside of normal range, client performance is directly impacted. For example, Outlook and Outlook Web App (OWA) users will report Outlook is slow when opening mail or moving between folders. Faster disks, more disks, or redesigning existing disk arrays are all ways to mitigate storage issues. Notes from the field
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